Rohloff developments
- il padrone
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Rohloff developments
Postby il padrone » Thu Aug 27, 2015 9:39 pm
The splined sprocket carrier is the most beneficial one for me.
Looks good!
"An unjustified and unethical imposition on a healthy activity."
- hiflange
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Re: Rohloff developments
Postby hiflange » Thu Aug 27, 2015 11:24 pm
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Re: Rohloff developments
Postby il padrone » Thu Aug 27, 2015 11:41 pm
"An unjustified and unethical imposition on a healthy activity."
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Re: Rohloff developments
Postby slaw » Fri Aug 28, 2015 12:13 pm
I hold the cog tool on by putting the QR skewer back with a large washer. I place the shifter handle under the tow bar of our car, then apply downwards force on the chain whip. Always grease the threads before replacing the cog and it's not too hard to get off.
How often should the seals be replaced? My hub has done around 50K, so wondering whether it needs any other maintenance.
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Re: Rohloff developments
Postby il padrone » Fri Aug 28, 2015 2:59 pm
For me, the chain tool hooks the brickwork better, and the shifting spanner has a larger contact surface to push/kick on.
BTW, the best thing to do to hold the chain-whip is to secure the end around the sprocket using a cable-tie
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- Leaf T
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Re: Rohloff developments
Postby Leaf T » Sun Apr 10, 2016 4:21 pm
Anybody know if this is available in Aus at a non ball busting price?
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Re: Rohloff developments
Postby Mugglechops » Mon Apr 11, 2016 5:11 pm
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Re: Rohloff developments
Postby il padrone » Mon Apr 11, 2016 5:45 pm
It is a wider chainline - 3mm wider - equivalent to the outer sprocket on a triple crankset. This apparently has to be so on account of engineering design aspects to allow a 13t or 15t sprocket to be fitted on it. For me, the Hebie Chainglider is of greater benefit than the splined sprocket carrier.
I have bought a stock of 17t threaded sprockets from SJS Cycles (and a Thorn 19t for when I need to climb the Tibetan Plateau, or when the pins no longer push so hard), as from now Rohloff no longer makes the screw-on sprockets.
"An unjustified and unethical imposition on a healthy activity."
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Re: Rohloff developments
Postby rifraf » Wed Apr 13, 2016 11:08 am
What about at hibike, starbike or sjscycles?Leaf T wrote:Sad news I was looking at buying the splined carrier and a 17t cog but it looks like Bike24 aren't shipping Rohloff stuff to Australia anymore
Anybody know if this is available in Aus at a non ball busting price?
I'll probably get rid of my Rohloff if its going to be controlled by a cartel here in Aus.
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Re: Rohloff developments
Postby Leaf T » Wed Apr 13, 2016 9:31 pm
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Re: Rohloff developments
Postby tmac100 » Thu Apr 14, 2016 1:41 am
In my past purchases from Bike24, Starbike and Wiggle, it is best to make the order significant instead of ordering just a sprocket in this case.
Bottom line: www.starbike.com ships Rohloff to Australia. Hope this is useful info...
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Re: Rohloff developments
Postby Leaf T » Sat Apr 16, 2016 2:37 pm
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Re: Rohloff developments
Postby Leaf T » Mon Apr 18, 2016 12:47 pm
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Re: Rohloff developments
Postby il padrone » Mon Apr 18, 2016 2:33 pm
*Rode the Pig & Whistle Ride yesterday on a 42-17 (65" gear). Three 'gears' - seated, standing, and head down-tail up coasting
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Re: Rohloff developments
Postby Leaf T » Mon Apr 18, 2016 2:42 pm
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Re: Rohloff developments
Postby rifraf » Sun Jun 04, 2017 12:20 am
I have an idea that 1.9 is the new allowable ratio for riders under 100kg.Leaf T wrote:I'm currently running 38x16 but want to gain an even more hill climbing ratio and was thinking of going to 38x17 or 37x16. Any reason why one would be better over the other? Using a gear ratio calculator it says they are 2.2 and 2.3 respectively but I'm not sure how this would translate into use. Is .2 difference fairly small? Would .1 not be enough?
From Rohloff de:
"The higher the chainring/sprocket ratio, the lower the input torque to the gear-unit. It is imperative therefore that the chainring/sprocket factor does not drop below 1.9 (e.g. 34/17=2.0). The smallest permissible sprocket ratios for a rider weighing less than 100kg are: 40:21, 36:19, 34:18, 32:17, 30:16, 28:15, 26:14 und 26:13 = Factor ~ 1,9."
https://www.rohloff.de/en/products/spee ... index.html
I'm utilising a 34T crank ring and have a new splined carrier on the way with a new 18T hub cog to go with it.
I'm unsure what rear cog might best suit your 38T as I don't think Rohloff do a 20T so it will be an aftermarket version should one exist or a 19T should you with to use genuine Rohloff and/or stay within warranty terms.
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Re: Rohloff developments
Postby Rodgerbiltit » Sun Jun 04, 2017 8:02 am
I've arrived at a 38T chainring - 18T sprocket (2.1 ratio) combination after much consideration. There were multiple aspects to my decision...I'm utilising a 34T crank ring and have a new splined carrier on the way with a new 18T hub cog to go with it.
I'm unsure what rear cog might best suit your 38T as I don't think Rohloff do a 20T so it will be an aftermarket version should one exist or a 19T should you with to use genuine Rohloff and/or stay within warranty terms.
I noted what was my "comfort" (20km/hr at 80rpm) gear ratio on my derailleur bikes and aligned that with gear 11 (1:1).
The smallest chainring that my Specilites TA double spider would take was 38T.
The smallest Stainless Steel chainring that Surly make is 38T. There's a recurring theme here...
General "wisdom" suggests larger chainring/sprocket combinations wear less and there is less wear with uneven ratios - even ratios wear more? Time will tell...
I am very pleased so far with my choice. I run 24T, 34T, 44T -> 11-34T on my derailleur bikes and have been very pleased with my gear 11 choice. Whilst it only gives me three gears above (14), I find that with a fully laden tourer I'm not wanting to push any harder (except perhaps in a glorious tailwind situation) - downhills are my rest time.
As for the lower gears, I no longer have "granny gear", I now have "stump jump"!
Realistically I have two gears lower than my previous (derailleur) 24T-34T combination.
I have "issues" with balance at low speed and with a fully laden tourer climbing anything approaching a 20% gradient generally find it safest to get off and walk - I've never been too proud to push...
Overall, thus far I'm very pleased with my choice. A tincture of time will clarify!
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Re: Rohloff developments
Postby Warin » Sun Jun 04, 2017 9:03 am
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Re: Rohloff developments
Postby RonK » Sun Jun 04, 2017 10:24 am
When I had a Speedhub I used 39x17 for exactly the rationale you describe - so the most commonly used gear was 11th. Direct drive, no noise, no drag.Rodgerbiltit wrote:I've arrived at a 38T chainring - 18T sprocket (2.1 ratio) combination after much consideration. There were multiple aspects to my decision...
I noted what was my "comfort" (20km/hr at 80rpm) gear ratio on my derailleur bikes and aligned that with gear 11 (1:1)...
I find that with a fully laden tourer I'm not wanting to push any harder (except perhaps in a glorious tailwind situation) - downhills are my rest time...
As for the lower gears, I no longer have "granny gear", I now have "stump jump"!
This still yielded a top gear speed of around 45kph@90rpm with 26" wheels and allowed me to mostly avoid the noisy lower seven gears.
But when it came to climbing in the lower gears I often had to make double or even triple shifts. Rohloff make a big deal of the evenly spaced gears, but this is pure marketing spin.
Widely spaced gears are more usable at the lower end of the range, and closely spaced gears at the upper end.
Sheldon Brown explains why very well in his article on Gear Progression and in fact modern derailleur transmissions generally have very good progression.
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Re: Rohloff developments
Postby rifraf » Sun Jun 04, 2017 12:44 pm
My knees are fairly shot so my riding might be best described as a meander.RonK wrote:When I had a Speedhub I used 39x17 for exactly the rationale you describe - so the most commonly used gear was 11th. Direct drive, no noise, no drag.Rodgerbiltit wrote:I've arrived at a 38T chainring - 18T sprocket (2.1 ratio) combination after much consideration. There were multiple aspects to my decision...
I noted what was my "comfort" (20km/hr at 80rpm) gear ratio on my derailleur bikes and aligned that with gear 11 (1:1)...
I find that with a fully laden tourer I'm not wanting to push any harder (except perhaps in a glorious tailwind situation) - downhills are my rest time...
As for the lower gears, I no longer have "granny gear", I now have "stump jump"!
This still yielded a top gear speed of around 45kph@90rpm with 26" wheels and allowed me to mostly avoid the noisy lower seven gears.
But when it came to climbing in the lower gears I often had to make double or even triple shifts. Rohloff make a big deal of the evenly spaced gears, but this is pure marketing spin.
Widely spaced gears are more usable at the lower end of the range, and closely spaced gears at the upper end.
Sheldon Brown explains why very well in his article on Gear Progression and in fact modern derailleur transmissions generally have very good progression.
45km would be reached on my bike only on extreme declines when heavily laden and I've forgotten to replace my brake pads.
I wondered if I'd find my gearing too low when I dropped my 38T front ring to 34T.
Unfortunately not, hence my now adding a couple of teeth to my rear sprocket.
I'm now looking forward to actually utilising some of my higher gear positions on my shifter that have been for the most part redundant.
Being a weak rider my gear 11 wasn't seeing much use which is why I've decided to go lower again.
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Re: Rohloff developments
Postby VeloGiro » Tue Jun 06, 2017 4:19 pm
...I'm with you re lowering the gearing rifraf. I am running 39:19 and as a result find myself riding in the 11th gear "sweet-spot" for a lot of the time with this setup for those that are curious that equates to a 56.1 gear inch sweet-spot for this fella...Yep that's low... "Lowdown and Groovy"rifraf wrote: I'm now looking forward to actually utilising some of my higher gear positions on my shifter that have been for the most part redundant. my gear 11 wasn't seeing much use which is why I've decided to go lower again.
The added bonus here is access to a crazy low 1st gear...one that has been (thankfully) been used to good effect on rough steep and gnarly climbs in the Otways...best of both worlds really...with perhaps the downside spinning out at anywhere near 40 KPH but for me that's OK.
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