RoadBikeReview.com's Forum Archives - General


Archive Home >> General(1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 )


9 speed cog on 8 speed cassette(7 posts)

9 speed cog on 8 speed cassettepukka
Jul 31, 2002 5:40 AM
i want to use my old wheel on my home trainer,but it has an 8 speed cassette ,i recently upgraded to 9 speed ,could i put a 9 speed cog on to my 8 speed cassete so that the chain will fit,or any other suggestions would be welcomed
Put your 9 spd cassette in place of the 8 spd. (nm)Quack
Jul 31, 2002 6:16 AM
Put your 9 spd cassette in place of the 7 spd. sorry (nm)pukka
Jul 31, 2002 7:12 AM
i just realised its a 7 speed,somebody told me that the wheel wont take a 9 cassette
Put your 9 spd cassette in place of the 7 spd. sorry (nm)No_sprint
Jul 31, 2002 7:52 AM
I don't think a 9 speed cassette will fit properly on a 7 speed (orginally) hub. I could be wrong.
9 & 7 speedpukka
Jul 31, 2002 8:42 AM
thats what i was told,could i just replace 1 cog i dont need to change gears on my trainer/rollers
9 & 7 speedLC
Jul 31, 2002 8:59 AM
No, but you could use 8 out of the 9 speed cogs on a 7 speed hub. Not ideal for the road, but you could get by with it on a trainer.

If you mean that you only need one cog and you would not change gears, then just get it close with the shifter and then dial it in with the rear derail adjustment. You may even get lucky and not have to do anything.
9 & 7 speedjohnnybegood
Aug 2, 2002 6:43 AM
I made it work using guidance from Sheldon Brown's web site. I think he calls it "8 of 9 on 7". I have 9 speed Ultegra STI shifters on my old Klein (which has 126 mm rear spacing), an 8 speed hub with 8 cogs from a 9 speed set. You need to have 9 speed cogs,which are slightly thinner. More important, you need 9 speed spacers. Finally, you may need to file down one of the spline teeth on each of the cogs/ spiders if your hub is not a hyperglide hub. Hyperglide hubs have one spline tooth which is a different size than the others so that all the shifting ramps on the cogs line up properly.