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Folder with operatic range? Sing its praises here!

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Folder with operatic range? Sing its praises here!

Old 07-07-22, 08:37 PM
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Antifriction
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Folder with operatic range? Sing its praises here!

Tall gears and wide ranges are a challenge in tiny spaces. Rohloff, Schlumpf, and Nuvinci take it inside. Mobiky and Sinclair A-bike get special mention for 2-stage transmissions.
To lead things off, here's a 2009 Dahon I picked up last year. Came with 200% range, 37"-74"; now 530%, 16.5"-87".


taut...

Making the most of the humble 7-speed Tourney groupset, 11-34 / 28-48 hits two limits: 43t capacity of the RD, and 20t capacity of the FD. I wanted to see how the tensioner worked and looked pushed to its rating, so I tried the cross-chained gears, big-to-big (above) and little-to-little (below). Both quite ridable, not too noisy, but chain visibly bent into an S shape when viewed from above.


and slack

Last edited by Antifriction; 07-10-22 at 01:10 AM. Reason: clarity
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Old 07-07-22, 11:48 PM
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Ron Damon
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I used to own a folder with SRAM Dual Drive and a 11-36T cogset in the back. It had far too much range so I switched to a simple 1x.
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Old 07-08-22, 06:39 AM
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Originally Posted by Antifriction View Post
Mobiky and Sinclair A-bike get special mention for 2-stage transmissions.
I don't believe either one of those is still in production.

Last edited by tcs; 07-08-22 at 11:31 AM.
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Old 07-08-22, 03:02 PM
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88” to 21” (318%) here with a 11-46T cassette and a 52T chainring.
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Old 07-09-22, 07:29 AM
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Gee, Reddleman - your gear numbers, so much lower than the nominal-wheel-size approximation, startled me into measuring the weighted roll. Mine should be 7% lower.

I'm waiting to see if a 9-34t or 9-36t Capreo shows up. https://singletrackworld.com/2013/12...preo-cassette/

Last edited by Antifriction; 07-09-22 at 07:55 AM. Reason: added remark
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Old 07-09-22, 10:21 PM
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I have to admit that those numbers came straight from Sheldon Brown’s gear calculator. As it doesn’t have quite the same tyre size available as the Big Apples that I run, I rounded the numbers off to the nearest inch.

Although I can see that a 9T block is tempting, I’m wary of being reliant on overly niche hardware for my only bike, in a world where supply chains have taken a battering lately (learnt that one trying to repair a secondhand SRAM dual drive going in the pandemic).
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Old 07-10-22, 01:09 AM
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I'm a Sheldon fan, but 88/21 is actually 419%....
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Old 07-10-22, 05:56 PM
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You’re right, looks like I miss-typed it when entering the results here!
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