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
1302 15 42 0 13 - - 0.09
1303 17 47 0 14 - - 0.13
1304 20 52 0 15 - - 0.16
1305 25 62 0 17 - - 0.26
1306 30 72 0 19 - - 0.39
1307 35 80 0 21 - - 0.51
1308 40 90 0 23 - - 0.72
1309 45 100 0 25 - - 0.96
1310 50 110 0 27 - - 1.2
1311 55 120 0 29 - - 1.6
1312 60 130 0 31 - - 1.95
1313 65 140 0 33 - - 2.45
1314 70 150 0 35 - - 3
1315 75 160 0 37 - - 3.55
1316 80 170 0 39 - - 4.2
1317 85 180 0 41 - - 5
1318 90 190 0 43 - - 5.8
1319 95 200 0 45 - - 6.7
2201 12 32 0 14 - - 0.05
2202 15 35 0 14 - - 0.06