Question about chain slack for a track bike

daverdfw · June 8th, 2017, 08:14 PM

so I have just put on a new 520 O-ring chain with 1 track days worth of wear on it.

I am going to a smaller track saturday and wanted to go from a 45T to 47T rear sprocket.

After I put the 47T on, without tightening the axle I get 20mm of slack.

So my question is this. I can get a new chain from amazon tomorrow, and get a 120 link and use my chain breaker to shrink it. What should I shoot for? 108 links?

Thanks!

CC Cowboy · June 9th, 2017, 08:17 AM

Quote:

Originally Posted by daverdfw

so I have just put on a new 520 O-ring chain with 1 track days worth of wear on it.

I am going to a smaller track saturday and wanted to go from a 45T to 47T rear sprocket.

After I put the 47T on, without tightening the axle I get 20mm of slack.

So my question is this. I can get a new chain from amazon tomorrow, and get a 120 link and use my chain breaker to shrink it. What should I shoot for? 108 links?

Thanks!

The question is, will you always be at a smaller track or will you be using larger tracks also? You might need different chains for different sprockets in the future.

Triple Jim · June 9th, 2017, 08:23 AM

Or figure out ratios that always swap a smaller front and larger rear, keeping the chain adjustment within range.

daverdfw · June 9th, 2017, 11:56 AM

Quote:

Originally Posted by Triple Jim

Or figure out ratios that always swap a smaller front and larger rear, keeping the chain adjustment within range.

I have a 13T on order. wont be here in time for tomorrow unfortunately, I will just have 2 chains for different tracks, Not a bad thing.

Triple Jim · June 9th, 2017, 12:08 PM

Not terrible, but I'd rather not have to deal with rivets or master links with each ratio change. It's entirely possible though, that you can change a tooth up or down and not have to change chain length.

June 8th, 2017, 08:14 PM	#1
daverdfw ninjette.org guru Name: David Location: Fort Worth,TX Join Date: Nov 2015 Motorcycle(s): 2009 Ninja 250 Posts: 386	Question about chain slack for a track bike so I have just put on a new 520 O-ring chain with 1 track days worth of wear on it. I am going to a smaller track saturday and wanted to go from a 45T to 47T rear sprocket. After I put the 47T on, without tightening the axle I get 20mm of slack. So my question is this. I can get a new chain from amazon tomorrow, and get a 120 link and use my chain breaker to shrink it. What should I shoot for? 108 links? Thanks!

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June 9th, 2017, 08:23 AM	#3
Triple Jim Guy Who Enjoys Riding Name: Jim Location: North Carolina Join Date: Jul 2016 Motorcycle(s): Ninja 250 Posts: A lot. MOTM - Oct '18, Aug '17, Aug '16	Or figure out ratios that always swap a smaller front and larger rear, keeping the chain adjustment within range.

June 9th, 2017, 12:08 PM	#5
Triple Jim Guy Who Enjoys Riding Name: Jim Location: North Carolina Join Date: Jul 2016 Motorcycle(s): Ninja 250 Posts: A lot. MOTM - Oct '18, Aug '17, Aug '16	Not terrible, but I'd rather not have to deal with rivets or master links with each ratio change. It's entirely possible though, that you can change a tooth up or down and not have to change chain length.