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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 10-17-10, 10:17 AM   #1
tarmenel
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Skipping

Well I've finally come over to the dark side and decided to convert my racing setup to single speed. I bought a conversion kit and replaced the cassette and the deraileur with the chain tensioner. I then removed the smallest and largest chain rings on my XT crank and thought I was aces. As I gingerly set off I was going OK but as soon as I put pressure on the pedals the chain would skip. Please can you guide me as to what the problem may be. The chain is a single speed chain as well as the rear cog. The chainring is a nine speed chainring so this is what I think may be causing the problem but then I thought that the ss chainrings come in the same size 36T and the chainline is straight so that shouldn't be causing the problem, or is it? I've attached some pic's
IMG_6064..jpgIMG_6063..jpgIMG_6062..jpgIMG_6066..jpgIMG_6065..jpg
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Old 10-17-10, 10:36 AM   #2
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Maybe a mix of new and used parts, like new chain but used cog or vice versa.
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Old 10-17-10, 10:42 AM   #3
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Everything except the chainring is brand new. The chainring has only had a few rides maybe three or four and nothing longer than an hour and a half. Is it OK to use a regular chainring with the single speed chain?
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Old 10-17-10, 10:53 AM   #4
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Multi speed chainrings are designed to be able to shift well. The teeth are machined very differently from single speed chainrings. I would suggest getting a single speed chainring similar to this http://www.jensonusa.com/store/produ...Chainring.aspx. Other than that your chainline looks straight and it doesn't look like you have a slack chain or anything.
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Old 10-17-10, 10:56 AM   #5
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When you say SS chain, do you mean 1/8? Should be OK, but I've never had a SS or FG setup with a modern ramped and cut tooth chainring, only the old style 3/32 chainrings with full teeth and no ramps. Is it skipping up front on the chainring? You could try a standard 8 or 9 speed chain instead.
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Old 10-17-10, 10:56 AM   #6
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I'm leaning more in the line that its the chainring. Will this FSA chainring be compatible on a XT M770:
http://cgi.ebay.co.uk/ws/eBayISAPI.d...=STRK:MEWAX:IT
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Old 10-17-10, 11:06 AM   #7
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When you say SS chain, do you mean 1/8? Should be OK, but I've never had a SS or FG setup with a modern ramped and cut tooth chainring, only the old style 3/32 chainrings with full teeth and no ramps. Is it skipping up front on the chainring? You could try a standard 8 or 9 speed chain instead.
Thanks, I have ordered a SS chainring and will try to put a nine speed or eight speed chain on the bike in the mean time.
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Old 10-17-10, 12:12 PM   #8
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Multi speed chainrings are designed to be able to shift well. The teeth are machined very differently from single speed chainrings. I would suggest getting a single speed chainring similar to this http://www.jensonusa.com/store/produ...Chainring.aspx. Other than that your chainline looks straight and it doesn't look like you have a slack chain or anything.
i use a multispeed chainring. its fine.
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Old 10-17-10, 12:49 PM   #9
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I think it's chainline. I see a kink in the chain where it engages the chainring, and with a tensioner inline as opposed to a horizontal dropout setup, it's probably more willing to buck off the chain. My experience with matching worn parts with new parts is that they're just really noisy. The asymmetrical teeth shouldn't cause any problems- nothing has changed from multispeed as far as the front is concerned. FG would be different.
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Old 10-17-10, 01:10 PM   #10
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the chainline looks fine.
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Old 10-17-10, 02:59 PM   #11
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You should be able to run multi-speed chainrings on an SS no problem, I've done it on several bikes. The front ring is not the issue.

I had the same problem with my SS mountain bike. I think your chain is too long. See how the chain drops down almost vertically after the rear cog? It isn't engaging enough teeth which is why it only skips when you try to put the power down. Shorten your chain by a link, and then you'll have it wrapped around more of the cog. What gearing do you have on there? If you try to use super small gears this problem will be worse.
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Old 10-17-10, 05:25 PM   #12
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What FastJake said. Not enough chain wrap. Looks like you're only engaging 7 teeth out back. You may even be able to lose 2 chain links and add a half-link if losing 1 link doesn't do the trick.
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