I am running a set of 10 spd rings on a a 9 spd. It worked good enough BUT Branford has shims (.6 and .8 mm I think) maybe call them and ask they are REALLY knowledgeable. I ordered the .6 and it is indeed better.

 

Thanks, I checked their site first (before I posted) and saw the 9 to 10, but nothing about 8 to 10. I'll get a hold of them.

 

I could be wrong, but I was under the impression 8 to 9 was the same and 9 to 10 changed a bit. Guys at Branford know their stuff.....they'll know for sure!

 

hey you may need to replace the rear spacers on the casette, just a thought, I have an extra set of 9 speed spacers if it is needed.You are welcome to them (That will leave me with like at least 1 maybe two spare sets...LOL)

 

All new wheel/cassette, so no worries there. Everything will be new 10 speed EXCEPT the crank/chainrings.

 

Two issues

I do not know the real answer to your question but there are two possible issues that I see:

1. The 10-speed chain is narrower than an 8-speed chain. The teeth on your 8-speed chain rings are quite possibly too wide (thick) to work properly with a 10-speed chain. If they do "work" the extra width may be enough to cause the chain to fail. Essentially the wider teeth will push the chain's side plates off of the pins and the chain will break.

2. The width between the chain rings on the 8-speed is probably bigger than on a 10-speed. Shimming cannot make this distance smaller. At the very least, the 10-speed chain may not shift well. Worst case, it may be prone to becoming phisically wedged between the chain rings on the 8-speed cranks.

I would not recommend using this set-up until you have definitive answers on both of these questions.

 

You will likely encounter false neutral problems when shifting from large to small chainring.

 

Been using 98 Mirage 8 spd 39/53 chain rings with 07 Veloce 10 spd cassette and Chorus ultra narrow 10 spd chain for over a year with no probs.

 

Been using 98 Mirage 8 spd 39/53 chain rings with 07 Veloce 10 spd cassette and Chorus ultra narrow 10 spd chain for over a year with no probs.

As it should—the nominal difference in inside chain width between an 8- and a 10-speed chain is only 0.19 mm. The large differences are in outside chain width.

 

Thanks guys, I thought it should work, and recieved PM's from folks using 6 speed chainrings without issue.