that's a sensational analogy.toolonglegs wrote:Try stopping a car rolling down a hill in neutral with the engine turned off... You lose a huge amount of braking force.
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 jasonc » Tue May 22, 2012 5:35 pm
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby Crittski » Tue May 22, 2012 10:23 pm
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby Hotdog » Tue May 22, 2012 11:52 pm
Of the currently available forks the Evo A647 fork looks like the go and as I can fit MTB levers I can pick from all available disc brakes including the full range of hydraulics. I don't know a lot about these things but the 2012 Shimano XT hydros look good to me right now, not the lightest or prettiest option out there but they get good reviews from the MTB'ers and those cooling fins attached to the brake pads look like a very good idea for dissipating heat on those long descents. Anyway, the real question is which hubs? Ideally I'd like to minimise the 'bike mullet' effect (front-rear asymmetry) by re-using the current front rim in building a disc-compatible wheel, which would mean I need to stick to the current number of spokes (24, laced 2 cross I don't think that's necessarily too flimsy for a road disc wheel). The only disc compatible 24H hubs I've been able to find are the Novatec ones though, are they any good and are there any other options that I've missed?
Alternatively I could just wait a few months and end up with a bunch more off the shelf options for forks and wheels. I did tweet HED to ask what happened to the disc-compatible Ardennes and Stinger wheels that were shown at last year's Interbike, they responded saying that they're still tweaking them a bit but hope to have them out by the end of the (northern hemisphere) summer. The disc compatible Ardennes wheels would be almost ideal for me as my current wheels are HED Kermesse's, essentially the same as the current Ardennes CL.
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby Nobody » Wed May 23, 2012 12:00 am
Maybe running smaller ventilated discs will provide an aero advantage in the future.
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby MichaelB » Wed May 23, 2012 8:55 am
The Novatech are widely used, but another option is Circus Monkey They have plenty of 24 H front disc hubs, and are well priced and light to boot.Hotdog wrote: .... Anyway, the real question is which hubs? Ideally I'd like to minimise the 'bike mullet' effect (front-rear asymmetry) by re-using the current front rim in building a disc-compatible wheel, which would mean I need to stick to the current number of spokes (24, laced 2 cross I don't think that's necessarily too flimsy for a road disc wheel). The only disc compatible 24H hubs I've been able to find are the Novatec ones though, are they any good and are there any other options that I've missed?
.....
They have a good following on WW forums. There are plenty available via ebay too.
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby MichaelB » Wed May 23, 2012 9:22 am
Only fits the Hope V2 brakes though
Mind you, have put caliper spacers on Nissan 4 pot calipers on a road car before .......
Wonder what the width difference is to a std spec rotor ....
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby Hotdog » Wed May 23, 2012 9:53 am
Thanks Michael, the Circus Monkey hubs look ideal.MichaelB wrote: The Novatech are widely used, but another option is Circus Monkey They have plenty of 24 H front disc hubs, and are well priced and light to boot.
They have a good following on WW forums. There are plenty available via ebay too.
BTW I've exchanged a few more tweets with HED about their disc-compatible wheels, they've basically admitted that they're holding them back until the cyclocross frame builders settle on a single rear dropout spacing for disc equipped bikes. Pretty frustrating for those of us only interested in the front wheel anyway!
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby jasonc » Wed May 23, 2012 10:55 am
has front spacing been decided?Hotdog wrote:Thanks Michael, the Circus Monkey hubs look ideal.MichaelB wrote: The Novatech are widely used, but another option is Circus Monkey They have plenty of 24 H front disc hubs, and are well priced and light to boot.
They have a good following on WW forums. There are plenty available via ebay too.
BTW I've exchanged a few more tweets with HED about their disc-compatible wheels, they've basically admitted that they're holding them back until the cyclocross frame builders settle on a single rear dropout spacing for disc equipped bikes. Pretty frustrating for those of us only interested in the front wheel anyway!
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby cobba » Wed May 23, 2012 11:02 am
Vented V2 = 3.25mmMichaelB wrote:Only fits the Hope V2 brakes though
Mind you, have put caliper spacers on Nissan 4 pot calipers on a road car before .......
Wonder what the width difference is to a std spec rotor ....
Non-vented V2 = 1.85mm
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby MichaelB » Wed May 23, 2012 11:23 am
jasonc wrote: .... has front spacing been decided?
Currently, all hubs are 100mm OLN as far as I am aware, and seems to be no move away from that.
It's just the 135 vs 130 atm for the rears
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby twizzle » Wed May 23, 2012 11:37 am
Vacuum boosters were required due to the shifting from self-energising drum brakes to disc brakes. And the booster simply increases pedal force, it could just have easily been used with cable brakes.toolonglegs wrote:Try stopping a car rolling down a hill in neutral with the engine turned off... You lose a huge amount of braking force.
...real cyclists don't have squeaky chains...
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Adding a front disc to a road bike !! And Now Hydro!
Postby toolonglegs » Wed May 23, 2012 3:14 pm
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby Ross » Wed May 23, 2012 4:17 pm
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby Nobody » Wed May 23, 2012 4:49 pm
I believe the biggest arms race is still who can have the lightest carbon road bike. Bonus points for lots of bling.Ross wrote:Disc brakes on bike seem to be getting like the lights arms race, maybe this is the next generation disc setup for bikes
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby twizzle » Wed May 23, 2012 5:10 pm
That was just for lazy people and/or bad brake design (ie. brake systems using leading/trailing shoes instead of running two or more leading shoes with multiple slave cylinders) . And the vac booster isn't in the hydraulics (although some cars used a hydraulic slave cylinder through a vac booster to a second master cylinder, ie. "remote booster"), it's in the mech side and boosts the pressure applied to the master cyliner, but could just have easily boosted effort to a full mech system.toolonglegs wrote:Vacuum boosters have been around since early 30's... 20 years before discs where started to be fitted to production cars.yes just a simple way to increase braking force in hydraulic systems... Drum or disc. Not sure how you could vacuum assist a full mechanical system?.
...real cyclists don't have squeaky chains...
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby toolonglegs » Wed May 23, 2012 5:15 pm
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby Nobody » Wed May 23, 2012 5:21 pm
I think that was the original point. They don't exist because cable is inferior for whatever reason.toolonglegs wrote:Show me a car with cable operated mechanical brakes please... apart from drum activated hand brakes.
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby toolonglegs » Wed May 23, 2012 5:30 pm
They exist, but they are pretty rare I would think... but I still cannot see how you could vacuum assist a full mechanical system ie: cable operated cam system ... but anyway totally OT now.Nobody wrote:I think that was the original point. They don't exist because cable is inferior.toolonglegs wrote:Show me a car with cable operated mechanical brakes please... apart from drum activated hand brakes.
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby baabaa » Wed May 23, 2012 7:18 pm
Umm maybe just me but 24H seems too low in spokeage to me and you may/could/would have constant rotor rub. This would turn me into a loon as I hate any bike rub, rattle or squeaks so tend to ride ss most of the time.
Why not send an email to some of the o/s wheel building gurus like peter white, pro wheel builder or handspun before you start the build.
I would also say Peter Bundy would also be able and happy to help.
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby Hotdog » Wed May 23, 2012 9:02 pm
24 spokes were used on the Mavic Speedcity and similar wheels during that period a few years ago when a number of disc-equipped flat-bar roadies appeared on the market. There are also a few 24 spoke 29er wheels currently available, and Mavic are apparently releasing a 20 spoke front wheel in the 2013 Crossmax SLR wheelset (now that probably is a bit silly ). Furthermore the disc-compatible Ardennes CL cyclocross wheels that HED showed at Interbike last year use exactly the same rim (24 hole HED Belgium C2) that I'm taking about re-using. I think that as long as I keep away from skinny ultra-light spokes (e.g. go for DT aero comps instead of aerolites) then I should end up with a wheel that's strong enough for strictly on road use. If I'm wrong then the likely outcome is breaking spokes, if it happens regularly then lesson learned, I'll build a stronger wheel.baabaa wrote: Umm maybe just me but 24H seems too low in spokeage to me and you may/could/would have constant rotor rub. This would turn me into a loon as I hate any bike rub, rattle or squeaks so tend to ride ss most of the time.
Why not send an email to some of the o/s wheel building gurus like peter white, pro wheel builder or handspun before you start the build.
I would also say Peter Bundy would also be able and happy to help.
I can't see how the number of spokes could cause rotor rub though. The rotor is attached directly to the hub and the brake calliper is attached to the fork, no amount of flexing of the spokes and rim are going to make them move relative to each other.
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby AndrewBurns » Wed May 23, 2012 9:29 pm
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby Mulger bill » Wed May 23, 2012 10:19 pm
Six pot callipers have been tried before and now that Hope have ventilated floating rotors, I'd say we're there already...Ross wrote:Disc brakes on bike seem to be getting like the lights arms race, maybe this is the next generation disc setup for bikes
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby Hotdog » Thu May 24, 2012 12:56 am
The FSC29-C's? Looks like a nice set of wheels, let us know what you think once they arrive. Do you mind telling us how much they cost you?AndrewBurns wrote:Just ordered some carbon 29er disc wheels from Farsports for my CX commuter bike. 23mm carbon rims with 28 CX-ray spokes front and back and Novatec hubs, apparently around 1450 grams a pair.
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby AndrewBurns » Thu May 24, 2012 6:51 am
Yep that's them. All up including shipping and paypal fee was $681USD, they say shipping time will be between 20-25 days, I'll post some pics and weights when they come in.Hotdog wrote: The FSC29-C's? Looks like a nice set of wheels, let us know what you think once they arrive. Do you mind telling us how much they cost you?
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Re: Adding a front disc to a road bike !! And Now Hydro!
Postby MichaelB » Thu May 24, 2012 9:39 am
I'm looking at using a set of these rims to build a set around some Circus Monkey hubs that are on their way. The rear hub is their new CX one that is 130mm OLN.Hotdog wrote:The FSC29-C's? Looks like a nice set of wheels, let us know what you think once they arrive. Do you mind telling us how much they cost you?AndrewBurns wrote:Just ordered some carbon 29er disc wheels from Farsports for my CX commuter bike. 23mm carbon rims with 28 CX-ray spokes front and back and Novatec hubs, apparently around 1450 grams a pair.
If things work out right, they'll be as close as %^&* is to swearing at 1,400g.
The rims themselves are USD $384 shipped per pair. It's either those MTB rims or some 38mm deep carbon clinchers that come in at 60g per rim more.
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