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Folding Bikes Discuss the unique features and issues of folding bikes. Also a great place to learn what folding bike will work best for your needs.

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Old 02-18-17, 06:08 AM   #1
leoho5
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135mm Titanium Rear Triangle for Brompton

A 3rd party startup is offering a 135mm Brompton titanium rear triangle for those who may be interested in mounting a Rohloff or Alfine hub.

They are also offering chain tensioner with adjustable chain line.

https://vostok.bike/
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Old 02-18-17, 04:30 PM   #2
blakcloud 
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Thanks for posting this. It looks very tempting.
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Old 04-16-17, 01:49 PM   #3
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nice. before this was available i had to perform this slightly nervous procedure..
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Old 04-16-17, 01:54 PM   #4
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all went well, the 2x10 is a fast joy to use, and has tight gearing with the range of an ordinary peleton racer. it weighs 11.1 kg complete with schlumpf, rack and pedals
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Old 04-16-17, 04:43 PM   #5
tudorowen1
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Can't understand how a cassette would work on a Brompton.Fine until you fold it...I had a 5 speed freewheel on a Brompton and the chain was forever falling off when it folded..I had to keep the chain on in the folded position by using clothes pegs (pins in USA speak)
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Old 04-17-17, 01:37 AM   #6
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if you use a long-cage derailer it will take up most of the slack. was planning to add an extra tensioner on the lower jockey wheel a la steve parry. however havent got around to that as it has worked well without it, this because it turns out the chain rests itself in a predictable way on the derailer.

if you lay the bike on the side the chain might work itself off. but i hardly ever do that, so the parry solution has been put on hold. in my case it would suffice with a shorter tensioner than pictured. an alternative solution is using a bigger jockey wheel, but the chain is close to the ground as it is.
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