Steering Bearings
Product Specification

The entire basic steering assembly is called a Triple Tree, Triple Clamp, Steering Head, Steering Head Yoke, or Steering Stem. Up until around 1985 most, but not all, bikes used loose ball bearings for their steering races. These bearings have upper and lower outer races that are a tight press fit in the frame and a lower inner race that is press fitted to the steering stem. The upper inner race is a loose fit.

Bearing No. d D T B C R Mass
2203 17 40 0 16 - - 0.08
2204 20 47 0 18 - - 0.14
2205 25 52 0 18 - - 0.16
2206 30 62 0 20 - - 0.26
2207 35 72 0 23 - - 0.4
2208 40 80 0 23 - - 0.51
2209 45 85 0 23 - - 0.55
2210 50 90 0 23 - - 0.6
2211 55 100 0 25 - - 0.81
2212 60 110 0 28 - - 1.1
2213 65 120 0 31 - - 1.45
2304 20 52 0 21 - - 0.21
2305 25 62 0 24 - - 0.34
2306 30 72 0 27 - - 0.5
2307 35 80 0 31 - - 0.68
2308 40 90 0 33 - - 0.93
2309 45 100 0 36 - - 1.25
2310 50 110 0 40 - - 1.65
2311 55 120 0 43 - - 2.1
2312 60 130 0 46 - - 2.6