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Oops, I had forgotten about silly Shimano bolt pattern. A 46t chainring seems to be nearly £100 :(
If I size the chain for 50-40, is the worst case that it will be too loose if you cross chain in 34-11?
The mech will collide with the cassette if there's too much slack. Take the chain off the chainrings and see what happens to the mech when you pull the chain through.
frankenbike-
Ugly as sin, but cheaper
30T inner would also make the 11-40 debatable. -
Yeah, the bcd/bolt pattern are definite limitations.
I've seen videos of people running GS r8000 rear mechs in the same setup, and the r8000 mech claims a capacity of 39T so I'm hoping it will work, but it would be nice to hear of someone who has first hand experience.
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Oops, I had forgotten about silly Shimano bolt pattern. A 46t chainring seems to be nearly £100 :(
Then it's cheaper to just go for a CX chainset;
https://www.chainreactioncycles.com/shimano-105-cx50-double-10sp-chainset-black/rp-prod70118
standard 110BCD with 5 bolts, you can fit a 34t inner ring if you wish, but 46/36 is actually quite nice with a 11-40t.
slothy
cjr
edscoble
Do they do a 46T chainring for Tiagra? I got a cx chain set on bike (ultegra) for this very reason, but the bike in question is replacing a mtb with mega easy gearing and is already at the top of the budget so I'm just trying to get as easy a gear as possible without breaking the bank.
Has anyone actually tried exceeding the capacity? If I size the chain for 50-40, is the worst case that it will be too loose if you cross chain in 34-11?