SRAM 10sp cassette doesn't fit 10sp Dura Ace Hube ?????

MichaelB2

To those that have some inkling on this.

Looking at options for gearing on the new bike in tackling some of the steeper hills here in Australia, and the new bike comes with WH-7801 Dura Ace wheelset.

I have seen disclaimers on sites selling the 10sp SRAM cassettes that they are "not compatible with 10sp Dura Ace Hubs, but will fit on 9/10sp Shimano hubs" :? :?

What is the difference ? Does this mean that with my Shimano wheelset, I can only fit shimano cassettes ? :roll:

I have used SRAM in the past & they have been great, so would prefer to use them (more price competitive also).

Tried searching Sheldon Brown's site, but doesn't seem to cover this issue

BTW, the bike is an Argon 18 Platinum

Cheers

Michael B

John.T

The Dura-ace hubs have a different spline with higher raised sections.

magliaceleste

Ah but the newest ones don't from what I understand.

Good old Shimano decided on taller splines on their Ultegra (6600) 10spd wheelsets and Dura-Ace wheelsets. My understanding is that they've now decided to change back to the lower splines (old 9/10 style) on the latest DA wheels (7850). Not sure about your 7801 wheels but I think they are the tall ones.

I fell into that trap too when I got a 11-26 SRAM cassette for the Ultegra wheels I had back then.

Edit: Sorry so the answer to the OP question is: Yes, you can only use Shimano cassettes on your hub if they are the tall splines.

MichaelB2

Oh bugger.

Many thanks guys.

Some of the answers also indicated that the issue was the width of the cassette (SRAM is 1mm wider than Shimano).

That makes life a bit harder, as I wanted to get a better hill climbing friendly ratio for an up & coming sportive type event, and the 12-27 won't quite cut the mustard. Some biggish hills at the latter stage of the event.

So it looks like a R700 compact crank may be the solution. Either that or a bloody file ...

Cheers

Michael B

John.T

Check which model of Dura-ace your wheels are. I can find no record of WH-7801 on their websites, only WH-7800 which are the high spline models and do have a narrower freehub. All low spline models are OK with the SRAM. Shimano 10sp cassettes use a shim on these.
Shimano say you can only use a 27 cog with the short cage rear mechs but they will take a 28 with care. However this is only a 1.4" lower gear which is hardly worth bothering with. If you are worried that a 27 will not be low enough then you do need to be thinking of a compact which will lower the bottom gear using the 27 by 5".
If you want to check potential gear ratios use Sheldon Brown's gear calculator.
http://sheldonbrown.com/gears/

itisaboutthebike

yes I've fell faoul of this as I wanted an 11-28.

IRD make a 11-28 (and 12-28) cassette that are compatible (i believe ) with the riased splines.

I've gone for an Ultegra 12-27 and am changing the 34 to a TA 33 (£21-50 on offer currently from Spa cycles)

MichaelB2

My wheels are definitely the WH-7801, but not the SL's

http://techdocs.shimano.com/techdocs/in ... !542093519

I did the 11-28 without issues on my previous bike (9sp Shimano), but am loathe to buy an SRAM cassette if it doesn't fit.

the 11-28 would replace the current 12-25, so the added inches would be more than useful. Sheldon brown is very useful - one of my favourites.

Mind you, an R700 crankset is likely, easily done, and can make it 36/50 easily, or convert it back later for flatter rides.

Who is IRD ???? Do you have a link ?
Cheers

Michael B

rustychisel

I tolds you already. :shock:

itisaboutthebike

http://www.interlocracing.com/

itisaboutthebike

BBB do a 12-28 10 sp Shimano compatible cassette (Parkers sell them £41).

However I don't think they're particularly light(about 300g) as they don't use an alloy spider for the biggest sprockets.

MichaelB2

Thanks guys for all the assistance & links

Ooroo