Adding a front disc to a road bike !! And Now Hydro!
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby Mulger bill » Tue Jan 08, 2013 2:54 pm
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby Mark Kelly » Wed Jan 09, 2013 5:08 pm
I'm a convert. No problems at all for the whole trip. No sign of overheating on long, twisting descents at high speed. We got bucketed on near Piper's River and the brakes worked perfectly. We were heading into the entrance of a narrow track when my wife decided she couldn't make it and stopped suddenly in front of me. I had to panic stop as I couldn't pass; on my road bike I'd couldn't have stopped in time - on these I had no trouble at all.
Take home lesson: If a 160mm disc will stop the juggernaut that is my fat arse on a laden touring bike, you should all be fine.
I borrowed my son's bike for the trip as my new bike wasn't ready in time. The new bike is now complete and sports BB7s, I'm thinking about converting a pair of Magura MT2s to fit the Campy ergos.
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby baabaa » Wed Jan 09, 2013 7:18 pm
Been running my road bike with calipers on road, and the sscx with canti brakes off road quite a lot during this dry summer and been happy with the braking. Still think discs are great for day in day out commuting and a one bike that can do it all, but now not sure I would go discs for a fast light road bike if I would ever needed to update my current ride (doubtful as current bike works across so many levels of the type of riding I do)
Worst still, if I was in the market for a new cross bike I wouldn't even think about discs and just go for a thing that would/ could do it all and yet make one smile by just looking at it..... http://www.ritcheylogic.com/dyn_prodfamily.php?k=472408" onclick="window.open(this.href);return false;
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby MichaelB » Thu Jan 10, 2013 9:24 am
Can you elaborate why yopu think they wouldn't work on a fast light road bike vs any other roadie ?baabaa wrote: ..... Still think discs are great for day in day out commuting and a one bike that can do it all, but now not sure I would go discs for a fast light road bike if I would ever needed to update my current ride (doubtful as current bike works across so many levels of the type of riding I do)
....
I'm aming for 7kg all up for my double disc Voalgi Liscio (when the frame finally arrives), and can't wait to ride it.
180mm disc on the front and 160 rear
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby Mulger bill » Thu Jan 10, 2013 10:31 am
You better post loooooottts of pics...MichaelB wrote:Can you elaborate why yopu think they wouldn't work on a fast light road bike vs any other roadie ?baabaa wrote: ..... Still think discs are great for day in day out commuting and a one bike that can do it all, but now not sure I would go discs for a fast light road bike if I would ever needed to update my current ride (doubtful as current bike works across so many levels of the type of riding I do)
....
I'm aming for 7kg all up for my double disc Volagi Liscio (when the frame finally arrives), and can't wait to ride it.
180mm disc on the front and 160 rear
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby baabaa » Thu Jan 10, 2013 10:34 am
I guess I have now found it is good having the choice of which bike to ride and lucky enough to have both. Still like the thought that has gone into the Voalgis.....
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby Nobody » Thu Jan 10, 2013 11:31 am
Since I have a wet bike now, I changed to a V brake recently. Although I did get brake feel similar to a disc in the dry, I couldn't get rid of the squeal problem so went back to disc.
IMO the main disadvantage of disc for road bikes is more aero than weight. I read somewhere that Zipp did some testing to find (not surprisingly) that discs are poor for aero. Obviously this drag would have more effect on smaller riders as a percentage of their total drag than bigger riders.
Even if discs become legal for road racing, I doubt they would be used as anything more than specific wet day bikes.
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby MichaelB » Thu Jan 10, 2013 3:30 pm
That's the plan. Will even be a full writeup on BNA as wellMulger bill wrote: You better post loooooottts of pics...
In my mind, where the discs come into their own is in two cases - long descents and in the wet. I strike both of these in Adelaide (mind you, it's been pretty dry for a while). I find that the rim brakes can get grabbier at the end of a descent.baabaa wrote: Micheal, not "they wouldn't work" just thinking that I now wouldn't bother as a rim/caliper set up delivers for my riding fast light road bike needs (which is not really that fast or light, more long medium paced rides and medium/ light weight).
I guess I have now found it is good having the choice of which bike to ride and lucky enough to have both. Still like the thought that has gone into the Voalgis.....
If I had multiple bikes, they'd all be disc equipped.
Interesting comments.Nobody wrote:The main reason I chose 185 over 160 BB7 on the front was to make emergency braking from the hoods easier as this was the main problem I had with caliper brakes. At the time of build the bike was going to be a all-weather bike so the disc presented a clear advantage.
Since I have a wet bike now, I changed to a V brake recently. Although I did get brake feel similar to a disc in the dry, I couldn't get rid of the squeal problem so went back to disc.
IMO the main disadvantage of disc for road bikes is more aero than weight. I read somewhere that Zipp did some testing to find (not surprisingly) that discs are poor for aero. Obviously this drag would have more effect on smaller riders as a percentage of their total drag than bigger riders.
Even if discs become legal for road racing, I doubt they would be used as anything more than specific wet day bikes.
Yes, discs are aero poor compared to rim brakes, but by how much in the overall scheme of things when compared to the body sitting on top of the bike and thrashing away ?
Will discs be used at the WT level ? No idea, but it would be a brave team that would take the first step.
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby Nobody » Fri Jan 11, 2013 9:23 am
I've heard the term two thirds rider, one third bike from an expert like Obree on some video (this is regard to track TT with skin suits etc, so I suspect road bike would be more like 80/20 average). If discs produce 10% more drag for the bike at top speed on the flat than a normal road bike and we make the assumption of 80/20, then we're looking at a possible 2% on the flat at top speed (< 1Km/h). When combined with hills, corners and other normal stuff it would probably make < 1% difference to the average faster rider (< 0.4 Km/h). A pro would obviously notice the difference, the average rider won't go fast enough to really notice. In a bunch it won't matter. As said above a bigger rider like yourself is going to measure the difference even less.MichaelB wrote:Yes, discs are aero poor compared to rim brakes, but by how much in the overall scheme of things when compared to the body sitting on top of the bike and thrashing away?
My riding is mainly flat. To me it felt slightly faster on 16/20 spoke racing wheels with V brakes than 32/36 spoke touring wheels with disc on front. All other things were equal.
Hopefully in time you or someone will do some back to back tests to see how much difference it really makes to the average rider. I suspect barely noticeable, like 3Kg in bike weight.
In the end we run discs because they do the job better in wet conditions, which prevents injury.
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby Mark Kelly » Fri Jan 11, 2013 9:50 am
Actually less than 1%. Power required to overcome drag increases as the cube of speed, so if the drag is increased by 2%, at constant power output speed will decrease by about 0.7%. This ignores other drains on power (tyres, friction etc) but they will work to reduce the speed deficit so it's good enough for Government work.Nobody wrote: If discs produce 10% more drag for the bike at top speed on the flat than a normal road bike and we make the assumption of 80/20, then we're looking at a possible 2% on the flat at top speed (< 1Km/h).
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby Nobody » Fri Jan 11, 2013 10:24 am
Good point. Thanks.Mark Kelly wrote:Actually less than 1%. Power required to overcome drag increases as the cube of speed, so if the drag is increased by 2%, at constant power output speed will decrease by about 0.7%. This ignores other drains on power (tyres, friction etc) but they will work to reduce the speed deficit so it's good enough for Government work.
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby MichaelB » Fri Jan 11, 2013 11:31 am
Not really comparing apples with apples there are we .....Nobody wrote: ..My riding is mainly flat. To me it felt slightly faster on 16/20 spoke racing wheels with V brakes than 32/36 spoke touring wheels with disc on front. All other things were equal..
+100 !!!Nobody wrote:
....In the end we run discs because they do the job better in wet conditions, which prevents injury.
I'm even looking at the M820/Zee caliper and wondering what the relative piston sizes are so that I can see if it will work with the Parabox m/cyl size. I like the idea of 4 pistons and a big pad
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby Mulger bill » Fri Jan 11, 2013 10:41 pm
Oh, I think it's a little bit more than thatMichaelB wrote:+100 !!!
Adding a little variable to the whole mix: If running discs lets you brake later and harder for bends etc, would there be any net benefit even with the whole poor aero thing working?
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby drubie » Fri Jan 11, 2013 10:53 pm
Road racing no, criteriums maybe.Mulger bill wrote: Adding a little variable to the whole mix: If running discs lets you brake later and harder for bends etc, would there be any net benefit even with the whole poor aero thing working?
but really, that's rubbish. We get none of it because the choices are illusory.
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby boyracer » Fri Jan 11, 2013 10:55 pm
do tell...hydro box or something else in mind?Mark Kelly wrote: I'm thinking about converting a pair of Magura MT2s to fit the Campy ergos.
Was/is there a 130/135mm campy compatible rear hub?
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby Mark Kelly » Sat Jan 12, 2013 9:49 am
No I don't like the idea of a conversion box. My intention is to remould the cylinder housing in carbon to make it the shape of a Campy ergo and then attach the gear shift mechanism. I'll also need new levers but they're easy to make. Still trying to figure how to get the cable run right and allow good access to the bleed port - it may yet defeat me. I won't ride Shimano ever again and I could die before Campy sees the light and makes direct hydraulic ergos.boyracer wrote:do tell...hydro box or something else in mind?Mark Kelly wrote: I'm thinking about converting a pair of Magura MT2s to fit the Campy ergos.
Was/is there a 130/135mm campy compatible rear hub?
To get a Campy compatible 135 rear I used a DT swiss hub and swapped out the freehub section. IIRC I had to put a 0.5mm spacer in to get things right. I also under-dished the wheel by 3mm to get the DS / NDS ratio to 0.7 which is roughly equal to 1.5^2 / 1.8^2 (revos / competitions if you use DT swiss spokes). I built the rear end of the frame to match so they only go together but that's not a problem for me - I don't have mechanics chasing me with spare wheels.
Stuck any boron through yourself yet?
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby Nobody » Sat Jan 12, 2013 10:10 am
You might die before Shimano and SRAM do it too.Mark Kelly wrote:I won't ride Shimano ever again and I could die before Campy sees the light and makes direct hydraulic ergos.
I came close to getting cleaned up this morning on the Victoria Road crossing of the bay to bay ride. The light was red for Victoria Road traffic and I'm crossing at the ped/cycle crossing and heard something behind me to the right. I look back to see this big dual cab 4WD ute go straight through the red and keep going like nothing had happened. Sunlight must have been in his/her eyes. It can happen at any time...
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby boyracer » Sat Jan 12, 2013 12:37 pm
Now you're talking. I too have tried this. only to mock up stage in card and filler.The change of dangle angle in the (alloy) lever stumped me but i have not done any small part layups before...only 35 ft boats!Mark Kelly wrote:.... My intention is to remould the cylinder housing in carbon to make it the shape of a Campy ergo and then attach the gear shift mechanism. I'll also need new levers but they're easy to make. Still trying to figure how to get the cable run right and allow good access to the bleed port - it may yet defeat me. I won't ride Shimano ever again and I could die before Campy sees the light and makes direct hydraulic ergos.
To get a Campy compatible 135 rear I used a DT swiss hub and swapped out the freehub section. IIRC I had to put a 0.5mm spacer in to get things right. I also under-dished the wheel by 3mm to get the DS / NDS ratio to 0.7 which is roughly equal to 1.5^2 / 1.8^2 (revos / competions if you use DT swiss spokes). I built the rear end of the frame to match so they only go together but that's not a problem for me - I don't have mechanics chasing me with spare wheels.
Stuck any boron through yourself yet?
boron in fridge awaiting vac bag. Maybe combo rack/guard for commuter?
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby MichaelB » Sat Jan 12, 2013 12:40 pm
SRAM is close (HydroR) and reportedly Shimano is doing something for 2014 .....Nobody wrote:You might die before Shimano and SRAM do it too.Mark Kelly wrote:I won't ride Shimano ever again and I could die before Campy sees the light and makes direct hydraulic ergos.
...
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby Gassy » Sat Jan 12, 2013 7:40 pm
Interesting article.. I saw the other day that specialized now have a roubaix available with discs too..
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby toolonglegs » Tue Jan 15, 2013 5:23 am
May not be very important in Australian conditions but interesting all the same.
http://velonews.competitor.com/2013/01/ ... mud_271112" onclick="window.open(this.href);return false;
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby Nobody » Tue Jan 15, 2013 10:51 am
Still on my first set of sintered pads on the road, which is since March 2010. Obviously where I ride is fairly flat and flowing. Don't need brakes much.
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby MichaelB » Tue Jan 15, 2013 11:23 am
Yes it is interesting, but contains a few errors.Gassy wrote:http://reviews.roadbikereview.com/why-y ... oad-bike/2
Interesting article.. I saw the other day that specialized now have a roubaix available with discs too..
There is also the Hope V-Twin system available (similar in operation to the Parabox) out as well.
Why does he complain about the rear brake cable routing when the front (on the Parabox) is EXACTLY the same ? The 324 Labs system is still in pre-order stage (and the page doesn't seem to have been updated for some time) and looks a bit messier than the Parabox (imho).
I'm curious as to what the weight comparison between all of the three systems is. Also, curious re the pad sizing on the Formula calipers.
As Nobody mentioned, it's still early days re development of CX/Road discs, and I think there is much to come.
SRAM's HydroR is the next step chnage, and probably Shimano's system will be the next big change.
Until then, we wait ......
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby MichaelB » Tue Jan 15, 2013 11:27 am
Seems like the issue was with cable discs only. No mention of any issue with the Hydro equipped ones - or did I miss something ?toolonglegs wrote:Disc Brakes had a bit of a shocker this last week at the US CX nats... was pretty funny watching some of the races. The Cannondale riders had no choice but to run them... but everyone else was back on canti's.
May not be very important in Australian conditions but interesting all the same.
http://velonews.competitor.com/2013/01/ ... mud_271112" onclick="window.open(this.href);return false;
Have done 3,000+km on my Parabox discs (plenty of descents with hard braking) and the pads are still fine.
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby rkelsen » Tue Jan 15, 2013 11:55 am
They were using cables, but one of the mechanics made this comment:MichaelB wrote:Seems like the issue was with cable discs only. No mention of any issue with the Hydro equipped ones - or did I miss something ?
"Mechanic Chandler Snyder of Chandler Cycling Service, who has been working on many a distraught rider’s disc-equipped bike on Thursday and Friday, says hydraulic brakes would have helped, but added that “the pads are wearing so fast here that they would not last through the race either.” "
Discs are meant to shine in these conditions. This is proof that they're not all that they're cracked up to be and that there is no perfect, one-size-fits-all solution when it comes to bicycle brakes.
The largest obstacle when it comes to disc brakes on a bicycle is weight. If you want better braking, you need bigger, thicker [and therefore heavier] discs and pads... But then you have to push all that extra weight.
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