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SHIMANO 105 FC RS520 12 SPEED CRANK 50 34T Crank Arm Length:175mm SlideLock quick release fittings allow SlideLock quick release fittings allow the rider to attach or remove the Journey trailer easily Shimano SRAM MTB Road 8 9 10 speed FT RR Front Rear Diameter 700C 700C Type Tubeless Ready (TLR) Clincher Tubeless Ready (TLR) Clincher Cassette compatibility Not applicable Shimano SRAM MTB Road 8 9 10 speed Hub width 100 mm 130 mm Hub model TK 31 TK 32 Holes 24 24 Butting 14 14 Cross section Round Round Brake type Rim brake Rim brake Attachment Quick release Quick release Nipple locking type Brass Brass Valve Presta Presta Material Rim Aluminium Aluminium