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What gearing for 20inch rear wheel

Printed From: BHPC Forum
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Forum Name: Building
Forum Description: Anything to do with building HPVs
URL: https://forum.bhpc.org.uk/forum_posts.asp?TID=5177
Printed Date: 27 March 2026 at 3:18am
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Topic: What gearing for 20inch rear wheel
Posted By: Andy TS
Subject: What gearing for 20inch rear wheel
Date Posted: 24 August 2015 at 11:23am
Having put the 20inch rear wheel back on the Allewedder the gearing understandably is really low with the 52tooth chainring (87 - 30 gear inches) spinning out at 25mph

What gearing are people gerenally running with 20inch rear velos?

I have a monster 75tooth chainring which will give me quite a healthy range (125 - 43 gear inches) BUT a touch too high lowest gear for the hills and not sure it would be much use using the front derailier to shift off it...

may just stick it in anyway and just HTFU Angry


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Allewedder A2, Broken Optima Baron Lowracer



Replies:
Posted By: AlanGoodman
Date Posted: 24 August 2015 at 11:44am
My little Catrike Speed has a Schlumph HSD which gives an effective 30/75 and works very well. 

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Posted By: Andy TS
Date Posted: 03 September 2015 at 12:06pm
got the big Chainring in but having a few alignment issues on the chainrun which are fiddly and frustrating but not insurmountable 




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Allewedder A2, Broken Optima Baron Lowracer



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