Mountain Bike Crank Bolt Size

Bnvb bike crank arm set 170mm 104 bcd mountain bike crank set with bottom bracket crank and chainring bolts for mtb bmx road bicyle compatible with shimano fsa gaint black red silver.

Mountain bike crank bolt size. Some bike fitters will have an adjustable crank so the pedal can be moved to simulate crank lengths from 155 185mm. You can try this during a bike fitting. Attaches brake system to both. Some brakes use a t25 bolt head purpose.

Normally a 5mm pinch key would do the work. But if your crank has bigger bolts use a key with a larger diameter. On triple cranks and on most mountain 2 10 and 2 11 set ups there are 2 bolt circle diameters one for the large ring or rings and one for the small chainring. Be careful of the force you give to loosen up the bolts.

Crank bolts fsa m8 bolt 34 39 nm 304 347 in lbs fsa m14 bolt 49 59 nm 434 521 in lbs fsa megaexo crank adjusting cap 0 4 0 7 nm 32 53 in lbs fsa megaexo crank bolt pinch screws 9 8 11 2 nm 87 100 in lbs campagnolo 3 piece 32 38 nm 282 336 in lbs campagnolo ultra torque 42 nm 371 in lbs race face 54 nm 480 in lbs shimano 34 44 nm. A good bike fitter will help you find the best crank arm length for you. Mtb cranksets generally differ in three ways crank length bottom bracket bb type and number of chainrings. In this case they are usually designated as something like 104 64 bcd.

Most mtb cranks are 175mm long but riders with legs shorter or longer than the average may feel more comfortable on cranks that better match their measurements. If you are changing the cranks on an existing bike. One 5mm bolt behind top of fork below down tube and one on rear brake bridge above wheel. Options from 165mm to 180mm cover different limb lengths it could be worth your while to research what crank length is recommended for your inside leg measurement.

You can use a simple bolt loosening tool according to the bolt size.