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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 04-13-06, 09:44 AM   #1
JOHN J
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Hyperglyde cassete cog on SS

Whats up everyone? I hope all is well.

thanks for the input on my other post on the Roadie to SS.

Well I have to say I have just about everything I need to get up and running , Though it may not be the best package it will do for now.

Id like to keep my 52 ring on the crank and a 20 on the rear 69.6 gear inches, Should be ok?

The only 20 cog I have is from a hyperglyde cassete, no LBS (7) that I called had anything.

so How bad is using an HG cog on a SS.

Im sure Chainline /tightness needs to be more accurate... can the ramp on the cassete be rounded off to prevent grabbing?

If this works out Ill probably order some better parts but id rather get going now than online order one cog.

Many thanks

"John"
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Old 04-13-06, 09:49 AM   #2
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You should be ok. I've done it on various bikes for some time. If you have several old cassettes lying around, use the spacers from them. You can get the chainline dead on with smaller spacers.

If you have a LBS locally that specializes in BMX you might try them, but I think the current trend for BMX is to go with small rings and cogs for grinding.
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Old 04-13-06, 12:08 PM   #3
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THANKS FOR THE REPLY,

only one of the 7 shops near me has BMX stuff and your right on!!, small gears only!

the biggest cog on the shelf is a shimano BMX 16, Oh well.

Ill try the hyperglyde 20t cog and if its right I may order some SS specific stuff later on ,

it does get tiring ordering onesy twosy online.

right now Im short of spacers and it looks like Ill have to hit four or 5 shops and take what they have.

my other option would be to have one of the machinists here make me a partial out of somthing and then use the singles to finish it /get chain line right.

many thanks

"John"
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Old 04-13-06, 12:39 PM   #4
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PVC pipe...
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Old 04-13-06, 12:40 PM   #5
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Ive heard that before!

What size 1.25" ??

"John"
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Old 04-13-06, 12:55 PM   #6
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dunno - I'd have to just get the closest match, bring in a cog or spacer to the supply house.
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Old 04-13-06, 01:00 PM   #7
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from my experience a ramped rear cog will shift at the worst possible moment.

do yourself a favor and order a 20t non-ramped cog. it is much safer in my experience (two crashes from sudden derailment in the span of 2-3 months before i learned my lesson).

for some reason ramped chaingirngs never give me a problem i am using one right now. but ramped cogs are bad news (and cheap to replace with a non-shifting type).
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Old 04-13-06, 01:04 PM   #8
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Quote:
Originally Posted by MTBR SS FAQ
You can use several regular cassette spacers available at any bike shop, or you buy some 1 1/4" Schedule 40 white PVC pipe from any hardware, then cut two thicker spacers to the proper length (to achieve good chainline), sandwiching the BMX cog in between.
Endless cogs
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Old 04-13-06, 01:07 PM   #9
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I'll jump in to advocate SS-specific cogs as well. Hyperglide cogs work great when there is a derailer pulley right there to guide the chain squarely onto the cog, but you won't have such a luxury with a SS, so it's very possible that the cog will ramp the chain up and off at a very inopportune moment. Go ahead and try it out with the hyperglide cog, but be very careful and try to find a proper SS cog (no ramps and pins, tall teeth, etc.) as soon as possible if you're going to keep with it.
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