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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 12-24-06, 07:22 AM   #1
SSDD
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Riding a R20 as a Single Speed

Hi !
I'm currently not riding a folder (But I own a R20 frame) but as a single speed rider I have a question:
Who rides a SS Raleigh Twenty and what is its current gear ratio ?
Thanks
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Old 12-25-06, 09:28 PM   #2
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Howdy,
My R20 isn't a single speed, but I do have a SS, 20" folder. I am running a 46x16 that gets me about 15mph at 90rpms. Hope this helps,
Juan
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Old 12-26-06, 01:15 PM   #3
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On my 20" inch fixed folder (not a Twenty though), I run 53/13 = 77 gear inches.
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Old 12-26-06, 01:27 PM   #4
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67 gear inches for the city, 72 gear inches for the suburbs.
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Old 12-26-06, 02:40 PM   #5
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Mine Twennie running 52 -> 14 as a fixie which gives me about 75 of your earth inches according the calculators I've used. It's pretty good for London though could afford to go down a tooth maybe on the rear for a bit of a higher top end.
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Old 12-26-06, 07:42 PM   #6
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My Twenty in the middle one to one gear (3 speed) is 52 to 18 (57 gear inches). Roger
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Old 12-26-06, 07:59 PM   #7
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Quote:
Originally Posted by james_swift
67 gear inches for the city, 72 gear inches for the suburbs.
+1
That is pretty close to what I run my fixed at (BTW it isn't a 20 either I actually think my city gear is around 64"...

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Old 12-27-06, 04:04 AM   #8
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Thanks alot !!!

Thanks
I'm thinking about building a SS R20 using the stock chain ring (44t) so I'll try to use a corresponding cog (probably 16t cog)
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Old 12-27-06, 11:12 AM   #9
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Quote:
Originally Posted by SSDD
Thanks
I'm thinking about building a SS R20 using the stock chain ring (44t) so I'll try to use a corresponding cog (probably 16t cog)
That will give you about 55 gear inches, give or take (I don't know your exact wheel diameter). That'll give you about 13.5-14.5mph at 85-95rpms,
Juan
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Old 12-27-06, 04:25 PM   #10
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I would also aim for about 70GI. I have a SS with 77GI I used for commuting. I could only juuuust get it over a small 15% grade hill, and the downhills were OK. But I think what you need to do is check your average speed on the flats, aim for a 70-90rpm cadence and select the GI from there.

Probably you're looking at a 13T or 14T sprocket in the back with a 46T chainring (the stock one), which will give you around 25-30km/h on the flats comfortably.
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