7 & 8 Speed Interchangability ???

Levi_501

I run a 21 speed system on my tarmac spec R8, 13-21 cassette.

However getting hold of 7 spped cassettes is becoming more difficult.

I have researched the dimensions of 7 speed sprokets and spacers and they seem to be the same as 8 speed versions.

In a nut shell, could I run an 8 speed cassette with 7 speed gear lever ? albeit without the biggest sproket operational.

Thanks in advance.

cooldad

I think the spacing is the same. You could probably find a second hand 8 speed shifter really cheaply though and use all of them.

lvquestpaddler

I got one of these for my mtb roadie wheels

http://cgi.ebay.co.uk/Shimano-Sora-13-2 ... _997wt_932

five left!

Levi_501

Thanks guys

I have a really good SLX gear lever, hense not wanting to buy a used one.

The 13-23 does not have a T16, which I find the best gear for slightl gradients.

Thinking to buy an 8 speed to break it down and measure directly.

nicklouse

Levi_501 wrote:

In a nut shell, could I run an 8 speed cassette with 7 speed gear lever ? albeit without the biggest sproket operational.

Thanks in advance.

yes but you will need a new wheel/hub.

The Rookie

You can use 8 of the 9 speeds from a 9 speed cassette (SRAM come apart easily) on a 7 speed freehub, use a 9 speed shifter.

Simon

nicklouse

http://www.chainreactioncycles.com/Mode ... delID=6387
http://www.chainreactioncycles.com/Mode ... elID=38302
http://www.chainreactioncycles.com/Mode ... elID=40480

3 on CRC