Shimano double MTB Front Derailleur - real capacity (16T front tooth difference?)

Discuss light weight issues concerning mountain bikes & parts.

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ooo
Posts: 528
Joined: Sat May 21, 2016 12:59 pm

by ooo

Anyone tried to use double crankset with 16T tooth difference with shimano mtb front derailleurs? like 46-30 or 44-28

According to official info total capacity of 2x11 shimano mtb fd is 10T and 2x10 shimano mtb fd is 14.

But, I found some test links with examples where bigger front chainring difference is used :

2x11 di2 - official capacity=10
FD-M9070 --- test link 48-34=14T and 42-28=14T tested capacity
FD-M8070

2x11 dynasys - official capacity=10
FD-M9025
FD-M9020
FD-M8025
FD-M8020
FD-M7025-11
FD-M7020-11

2x10 dynasys - official capacity=14
FD-M986
FD-M985
FD-M786
FD-M785
FD-M677
FD-M676
FD-M675
FD-M618
FD-M617
FD-M616
FD-M615

2x9 sis - official capacity=14
FD-M817
FD-M815
FD-M667
FD-M665

2x9 sis - official capacity=12
FD-C600

2x9 sis - unknown capacity 12 or 14 (universal FD for 2x9 and 3x9)
FD-M971
FD-M970
FD-M961
FD-M960
FD-M806
FD-M805
FD-M773
FD-M772
FD-M771
FD-M770
FD-M761
FD-M760
FD-M601
FD-M600
FD-M581
FD-M580
FD-M531
FD-M530
FD-M511
FD-M510

2x6/7 - official capacity=14
FD-TY22-SS

2x5 - official capacity=14
FD-TY15SS
'

TheRookie
Posts: 911
Joined: Wed Jan 18, 2012 4:23 pm
Location: Midlands, United Kingdom

by TheRookie

I don't have a definitive answer, but
1/ Shimano are always conservative (see example below)
2/ It have shift but you have an issue with chain dragging on the lower section of the cage in small small.

In my case I have a 9-speed XTR short cage mech, maximum quoted sprocket size is 34T, I'm using it on a 40T expander with no issues at all.
Impoverished weight weenie wanna-be!
Budget 26" HT build viewtopic.php?f=10&t=110956

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