HB-RM50-F

Shimano quick-release front hub

Component details

Component type

Weight

139 g

Contributor-measured: 36-hole HB-RM50 quick-release front hub, without skewer. Axle dimensions not recorded.

Excludes skewers.

Technical specification

Read Shimano technical specification

Shimano HB-RM50 front hub exploded view: quick-release and nutted versions

Groupset membership

Exage 500EX A500

axle type

Quick release

spoke holes

36

Sources

Project owner’s 36-hole HB-RM50 front-hub measurement: 139 g without skewer, reported 7 November 2026 (opens in new tab)
Shimano Dealers’ 1990 Product Manual, page 32: HB-RM50-F membership in Exage 500EX; not the source of the measured weight (opens in new tab)Accessed 2026-11-07