Chain compatibility - 6 speed rear block to 8 speed front chainrings

[un.hinged]

Is it possible to use an older style six speed Shimano rear block with a front chain-ring designed for a 7/8 speed rear block? I am guessing that the older style may use a fatter chain, would that present a problem when changing gear on the front rings? Will this work? Are there any issues? Or do I need a matching rear block (and SIS shifter)?

I'm sure this has probably been asked before, so sorry if you're repeating yourself. I did a search but couldn't find a thread that answered this. Cheers..

 

[Erudin]

Yes it should work fine,

See also: http://sheldonbrown.com/speeds.html

Youtube Link: Bicycle Chain: All About 5, 6, 7, 8, 9, 10 Speed - BikemanforU - DIY Bike Repair

 

[raleighnut]

6 speed to 8 speed chain is OK its 9 and 10-11 where size changes .

 

[Nigelnaturist]

Even 7/8sp chain rings work with 10sp chains, its the thickness of the plate links that have got narrower as a rule, not sure about 11sp, not looked into it, and yes i have run a 10sp chain on a 7/8sp intended chain ring.

 

[un.hinged]

Thanks for the replies. I have been away from cycling for about 25 years... and there seems to have been a few changes! So there are some HUGE gaps in my knowledge - some tech has been invented and then been superseded meaning I have missed a whole dollop of development. It's all good fun trying to catch up though