made a mistake

[groome]

hey all i made a mistake when ordering a new rear sprocket for the gsxr rear wheel i accidently ordered a 42 tooth instead of a 40 that i am currently running.  am i gonna be silly fitting it to see what its like or should i just return it and wait for a 40 tooth? o im running a 17 front sprocket. has anyone run this setup and what did they think?

cheers

[FJmonkey]

I am sure others have run a 17/42 combo without problems. It is only a 5% difference in ratio. So your RPMs will be 5% higher to go the same speed as 17/40 combo. If you normally cruise at 4000 RPM then with the 42 you will be at 4200 RPM.

[FJ_Hooligan]

Pair that 42 rear with an 18 front.

[groome]

I am sure others have run a 17/42 combo without problems. It is only a 5% difference in ratio. So your RPMs will be 5% higher to go the same speed as 17/40 combo. If you normally cruise at 4000 RPM then with the 42 you will be at 4200 RPM.

ah when you say it like that it doesnt sound too bad. i wasnt sure if it would make her want to spend alot of time on the back wheel as i tend to like 2 to the black stuff.

[FJmonkey]

Pair that 42 rear with an 18 front.

Good idea, that will put the ratio nearly identical to the 17/40 combo and it is a little easier on the chain.

[Pat Conlon]

FYI 17-42 was the stock sprocket combo on my '84.

[racerrad8]

FYI 17-42 was the stock sprocket combo on my '84.

But it had a larger rear tire than the GSXR wheel...

Randy - RPM

[balky1]

17-42 is stock combo for 84?

[TexasDave]

17/42 gearing is stock fj84. I changed to 18/40 for lower highway cruising rpm.  Dave

[4everFJ]

In Europe, the stock gearing for 84/85 FJ1100 was 17/41.

[balky1]

In Europe, the stock gearing for 84/85 FJ1100 was 17/41.

Aaaah, I know I read it somewhere so I was puzzled now for a moment. Thanks!

Ivan