Originally Posted by thatracer .
Have a pair of 10 spd Ultegra STI shifters and 8 spd rear dura ace cassette. I've had bar-cons on my bike for sometime. Eventually will upgrade rear to 10 spd.
In the meantime can I install the 10 spd shifters and set the stop screw on the derailleur until i get my 10 spd rear cassette?
FWIW. The
conventional wisdom suggests that there is no difference between 8-and-9-speed AND 10-speed SHIMANO rear derailleurs ...
- I disagree ...
- No matter, either way
Shimano tries to avoid creatng outright orphans of its components ...
While I haven't checked the following, by
my reckoning IF you install the 10-speed Shimano shifters + IF you attach the rear derailleur cable at the ALTERNATE rear derailleur cable anchoring ([COLOR= #0000ff]at 9 o'clock ... it's what the "hook" is for[/COLOR]) then with your 8-speed Shimano rear derailleur you ([COLOR= #ff0000]¿[/COLOR])
should ([COLOR= #ff0000]?[/COLOR]) have close-to 8-speed Shimano indexing ...
- If THAT works, then attaching the rear derailleur cable in the "normal" position at 6 o'clock should yield 9-speed indexing with a 8-/9-speed rear derailleur ...
- And, if you attach the cable at 3 o'clock (with an 8-/9-speed rear derailleur, then you will achieve 10-speed Shimano indexing.
Maybe, maybe not.
You can replace the Freehub body with a newer Freehub body by either buying the Freehub body, separately ([COLOR= #ff0000]this can be costly if bought from an LBS -- information for swapping Shimano Freehub bodies is available from Sheldon Brown's website ... basically, you need a 10mm Allen Wrench[/COLOR]), or by
cannibalizing another Shimano hub (presuming the current rear hub is a Shimano hub).
FYI. If you opt for anything other than an 8-speed setup, then you will want to change the chain ...
- 9-speed chain with a 9-speed Cassette + 9-speed front derailleur
- and, with a 10-speed Cassette, you will need a 10-speed Shimano chain + a 10-speed Shimano front derailleur.
BTW. More recent 8-speed Cassettes from Shimano & SRAM are ramped ... ramping is
a good thing.