TREK SPEED CONCEPT SLR BLACK OXIDE OR STAINLESS STEEL HEADSET BEARING KIT (W513538 & W540243)
Black Oxide is a great alternative to Stainless Steel.
Upper Bearing – MR031 (37 x 48.9 x 6.5 – 36/45)
Lower Bearing – ACB4051K – (40 x 51 x 6.5 – 36/36)
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