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Bike component fitment: bottom bracket, headset, seatpost, axle

IS41 headset standard (integrated vs IS42 headset standard (integrated: specs compared

Updated 05 September 2026.

2
specs differ

IS41 headset standard (integrated and IS42 headset standard (integrated differ on 2 specs: shis designation, cup / bearing outside diameter.

SpecIS41 headset standard (integratedIS42 headset standard (integrated
SHIS designationIS41 (integrated (IS))IS42 (integrated (IS))
Cup / bearing outside diameter41.0 to 41.1 mm bearing outside diameter41.8 to 42.0 mm bearing outside diameter
Steerer diameter28.6 mm (1 1/8 in)28.6 mm (1 1/8 in)
Crown race30.0 mm crown race, or machined into the fork30.0 mm crown race, or machined into the fork

Questions and answers

How do IS41 headset standard (integrated and IS42 headset standard (integrated compare?

IS41 headset standard (integrated and IS42 headset standard (integrated differ on 2 specs: shis designation, cup / bearing outside diameter.

Compared here

IS41 headset standard (integrated, 41 mm)IS42 headset standard (integrated, 42 mm)