7 and 8 speed compatability? Q's

[reanimation]

Hi, I'm getting some wheels and would ideally like 7 speed, though 8 would be ok

the hubs are modern? Onza half fat branded.

I have a Deore LX old rear mech and thumbshiters

The thumbies handle 8's I know so...

:?: Can the old (7spd) Deore LX rear mech deal with 8 speed cassettes ok?

:?: SRAM or shimano, does it matter?

:?: can 7 speed cassettes go on these hubs with no probs?

either way I dont mind.

Cheers

 

[MJN]

you'll need a spacer to run a 7spd cassette or an 8spd will go straight on.

 

[neil__j]

:?: Can the old (7spd) Deore LX rear mech deal with 8 speed cassettes ok?
My 1993 7-speed XT mech and thumbshifter coped fine with the change to 8 speed when I had to replace the worn out cassette last year.

:?: SRAM or shimano, does it matter?
Don't think so, I used a SRAM cassette without any trouble.

:?: can 7 speed cassettes go on these hubs with no probs?
As MJN says you need a spacer, an alloy ring something along the lines of this.

 

[reanimation]

Many thanks

You people rule.

I just need to decide now.

Cheers

 

[Anthony]

The cassette spacings are identical between Shimano and SRAM. I think the spacings between 7-speed and 8-speed aren't quite identical, but they're close and I wouldn't be surprised if the thumbies would be ok. The only problem you might have is that SRAM do 11-32 8-sp cassettes and if you were tempted, you might well find that your old rm doesn't have a big enough capacity to cover all the combinations. But if you stick to 11-28, you should be fine in terms of rm/cassette compatibility.

 

[reanimation]

Got an 8pd in stock so may try that for now and report back if it works or not. seems rude not to use that spare gear on the thumbies if it works

thanks

 

[Agency_Scum]

1. Yes


2. What, compatibility, mechs, ratios or chains?


3. No, they'll need a spacer.

 

[reanimation]

Sorry about that, lost ya's on second Q.

I meant does it matter what brand cassette I go for, and seems the answer is no on that score.

 

[Agency_Scum]

Same spacing on both brands.

 

[MJN]

With cassettes,of the big modern 3,only campag are incompatible,that goes for 8,9and 10spd.Not sure about old Suntour stuff,used to know but its gone,bit of a problem as am considering xc pro for a build,does anyone else know?