Ed, for what it's worth my Sam has a CX-70, 8 speed chain and XD-2 crank 
with 43/34 rings. I can ride the top 4 rear cogs in the 43 without any 
chain rub but it can require a slight bit of trimming from time to time. 
The 34 ring runs quietly through all 8 cogs. No doubt the Claris will work 
fine for you. 
Full disclosure: I have a new Claris as a spare.


On Wednesday, November 30, 2016 at 7:27:26 PM UTC-5, ed wrote:
> I would like to seek your advise to help me build my 55 Cheviot.
> Bought it from Rivendell when I visited them last September 16, 2016.
> The headset, fork, and bottom bracket were pre-installed by Riv.
> This is my first full bike build so pardon my ignorance if I have chosen 
> the wrong set of components to make this work.
> Currently I am having trouble getting my front derailleur to work quietly. 
> The chain keeps rubbing the side of the derailleur (CX70) even after 
> making adjustment to the limit screws.
> These are the gear components installed:
> Shifters - IRD Silver SOS power ratchet Thumb shifters
> Front derailleur - Shimano CX70
> Crank - Sugino XD2 wide/double crank 40t x 26t
> Cassette - SRAM 8 speed 11-32
> Rear derailleur - Shimano Altus (RD-M310)
> Chain - Shimano 8 speed chain IG-51 (116 links then added 2 more links 
> because of the longer chain stay)
> Anyone care to comment/suggest on what I could have done wrong before I 
> give up and just bring my bike to our LBS.
> Ed Fausto

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