Hello Doug, Your post is very timely since I've been going through the exact same derailer swapping dance in the past week.
First, some history. At one point I ran a CX-70 der on my Sam with a friction shifted 8 speed 11-32 cassette and 43/34 double front rings. As Joe points out frequent trimming in the front ring was required. Solution: ditch the "light" CX-70 in favor of a "heavy" Claris double. Boom, instant gratification - no trimming, Sam and I are happy. Also, I can't say the CX-70 felt any better during shifts than the Claris does. FWIW I ran a Claris triple on a friction 8 speed Homer with 46-34-26 rings and never had any problems. Very nice combination. Present situation: on another frame I tried resurrecting the CX-70 with a 9 speed cassette, 46-34 rings and Silver 1 down tube shifters, thinking the slightly narrower chain might work. No go, still had to trim in the big ring despite patient adjusting of the limit screws. Also, the D-rings (bees waxed threads) on the shifters were as tight as I could get them but no success. It has crossed my mind that the front shifters might be slipping just enough to be a pain. Today, I'm changing over to the proven Sam-Claris 8 speed double setup but with a 46 tooth big ring. Oh, and the cranks are the much maligned Sugino XD. Garth, thanks for the reference to Andel. Forgot all about them! Good luck to both of us Doug! Best, Rich in ATL On Monday, May 10, 2021 at 11:44:40 PM UTC-4 Doug Williams wrote: > I have a Hilsen with 28.6mm seat tube and it looks like there is already a > shim on there to mount my derailer, a clamp on Shimano Claris Triple. The > shim seems to make it about 32mm. So if I replace this derailer, would a > 31.8/28.6 clamp on be correct? > > I found a bottom pull Shimano CX70 in that size that looks nice. Everyone > raves about the CX70 so I wonder if it would be better than my Claris? The > Claris basically works, but it is not exactly smooth. I am currently > running the Sugino Triple Crank 46-36-24 but I might switch to the Rene > Herse 42-26 or wait for Riv's Silver Triple 44-34-24 to be back in stock. > In any event, when this set of chain rings wears out, I am done with the > Sugino hidden bolt. I just stripped the bitch and had to drill it out, so > I'm done with hidden bolts. > > So...would the CX70 work with both double and triple 8 speed friction only > (Silver Bar End) shifters? Or is it only going to work with a double? Would > the CX70 be better than the Claris? > > Doug > > > > > > > > > > > > > > > > -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/rbw-owners-bunch/5df61609-1e7f-4fcf-8725-8a235c1b1170n%40googlegroups.com.
