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
1201 12 32 0 10 - - 0.04
1202 15 35 0 11 - - 0.04
1203 17 40 0 12 - - 0.07
1204 20 47 0 14 - - 0.12
1205 25 52 0 15 - - 0.14
1206 30 62 0 16 - - 0.22
1207 35 72 0 17 - - 0.32
1208 40 80 0 18 - - 0.42
1209 45 85 0 19 - - 0.47
1210 50 90 0 20 - - 0.53
1211 55 100 0 21 - - 0.71
1212 60 110 0 22 - - 0.9
1213 65 120 0 23 - - 1.15
1214 70 125 0 24 - - 1.25
1215 75 130 0 25 - - 1.35
1216 80 140 0 26 - - 1.65
1217 85 150 0 28 - - 2.05
1218 90 160 0 30 - - 2.5
1219 95 170 0 32 - - 3.1
1301 12 37 0 12 - - 0.06