3tj Chain cutting into swing arm

Dobbie · Post by **Dobbie** » Tue Jun 03, 2008 1:29 am

My bike has a 39 tooth rear sprocket fitted and it has been jacked up at the rear slightly higher than standard but this has combined to cause the chain to destroy the chain guide and start to eat into the swing arm in a relatively short space of time. What do you think, would a 45 tooth rear sprocket sort it or would you just go for a new chain guide. Trouble is I like the way the bike rides for road use with the 39 tooth on it. Anyone got any ideas or a decent guide??

zimm · Post by **zimm** » Tue Jun 03, 2008 2:19 am

bigger sprockets front and back to space the chain out and keep the final drive ratio you like.

Post by **Motorcycle Solutions** » Tue Jun 03, 2008 10:02 am

You should be on standard 16 front and 48 rear matey you can go to the lowest of 14 front and 41 rear i beleive,....

Dobbie · Post by **Dobbie** » Tue Jun 03, 2008 1:02 pm

Thanks a lot for the info. Ebay here I come!

Post by **Motorcycle Solutions** » Tue Jun 03, 2008 3:45 pm

Dobbie ebay no good got to this address :D

http://www.arracing.co.uk/anr.nsf/viewc ... +Sprockets

and go down to fzr400 rrsp don't worry about the year for they fit my 1989 model... better to go for 520 pitch chain (i can supply one for Â£50 posted and 520 sprockets they will last longer.. get direct from a & r racing...

http://www.arracing.co.uk

http://www.arracing.com

one of these will work

Order from these for this is where i get sprockets from and they are light weight renthals

To order the chain goto http://www.lajracingservices.com and fill the booking form in and in the top colum put mail order

oldgreg · Post by **oldgreg** » Tue Jun 03, 2008 6:09 pm

Use this table to work out which sprocket combination will give you the same gearing you have now.

http://shop.wemoto.com/info.dyn?title=S ... ear_Ratios

For instance, if you have a 39th rear and a 14th front your ratio would be 2.79. You could then keep very nearly the same ratio by using a combination of 48th rear 17th front (pretty much the biggest set available).

I'm running 45th renthal rear 14th afam steel front which is magic off the line (front wheel comes up just a little on the power in 1st

) especially now that i've refitted the EXUP (thanks again for that Chris :D ).

That said it does rev at about 7.5k when i'm cruising at 60mph

I got my bits from A R racing - Good money, and they were very helpful.

Dobbie · Post by **Dobbie** » Wed Jun 18, 2008 10:19 am

Spoke to wemoto and got a standard 19 front and 55 rear and izumi 428 chain Â£42 and that's with postage, o.k. it's not o ring but for what it gets used it'll do. I also got a new chain runner from a local breakers for a tenner. just need to sort the tension issue now :)

3tj Chain cutting into swing arm

3tj Chain cutting into swing arm

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Re: 3tj Chain cutting into swing arm

Re: 3tj Chain cutting into swing arm

Re: 3tj Chain cutting into swing arm

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