Re: Front derailleur & large chainring
Originally Posted by paulbcycling
I never use the medium - small cogs on the rear cassette when on the 30T front ring. The only use at all for the 30T is for very sleep climbs when I use the largest 2-3 rear cogs.
I still have the problem that the current SORA FD has a 50T max chainring use and I am running a 53T. I can live without using the small rear cogs on the 30T but use the 53T and middle 39T alot across the range.Is there not a Shimano FD that with work with the 53 or 52T large ring and middle 39T but would also allow the use of the large rear cogs when on the 30T?
Despite the conventional misconception, ALL Shimano front derailleurs will work with a 53t outer chainring & a 39t inner-or-middle chainring.
Shimano is very conservative with regard to stating what their components are capable of coping with ...
I guess that
(maybe, in Shimano's Tech sheet!?!) once incorrectly stated that a 48t (?) was the largest chainring which a Shimano MTB front derailleur could handle -- it's just not true -- and, that misinformation has been repeatedly echoed ever since.
I have one bike set up with a top pull XT front derailleur + a regular Road Double crankset which currently has 52/39 chainrings at the moment ... sometimes, I change the outer chainring to a 53t and I subsequently need to move the derailleur higher on the seat tube OR lower if I later put the 52t-or-smaller chainring back on.
The misinformation about the capability of Shimano's MTB front derailleurs has apparently been replicated with regard to your SORA front derailleur.
Your Shimano SORA front derailleur can be used with a 53t outer chainring & a 39t inner-or-middle chainring.BTW. I use Campagnolo shifters with my Shimano derailleurs/cassettes/etc., so idealized ramping on the outer chainring isn't required for efficient shifting (Shimano had/(still has?) 'A' & 'B' ramping which are supposedly idealized for 42t & 39t inner chainrings, respectively).If you find that the shifting is balky, then consider selling your current Shimano shifters on eBay AND THEN buying a set of Campagnolo 10-speed (non-QS!) shifters -- the 10-speed Campagnolo shifters will mimic Shimano's 9-speed indexing if you use the hubbub.com alternate rear derailleur anchoring (at 3 o'clock vs. 6 o'clock).