Front derailleur rub

johncp

I've replaced a tiagra 12-30 10sp cassette with the same size Ultegra.
Now find that the front derailleur rubs when in small front/big rear - didn't with the tiagra cassette
I've adjusted the low limit screw on the FD and no movement left in it - cable slack, FD almost touching seat tube
Also, the RD is almost touching the spokes to allow change to biggest cog
Could this be down to the absence of a spacer on the cassette? (Its a powertap wheel)

e999sam

I believe you do need a 1mm spacer.

sungod

^this

tiagra 10-speed cassettes are unusual in that they have the spacing built-in

other shimano 10-speed cassettes on a 9/10-speed hub need a 1mm spacer (usually in the box with the cassette)

johncp

Thanks!

roadrider75

sungod wrote:

^this

tiagra 10-speed cassettes are unusual in that they have the spacing built-in

other shimano 10-speed cassettes on a 9/10-speed hub need a 1mm spacer (usually in the box with the cassette)

Thanks for pointing this out. I had no idea.