![]() Never press or drift in a new cartridge bearing by the inner race only. Although not the ‘approved’ method, if done carefully while keeping them parallel they’ll go in just fine. The Park BBT-39 presses make life easier, but an old bearing or pipe drift will do it in a pinch, as long as it measures 41.5mm in diameter.Įnsure that any wooden drift is properly flat, so that the impact is spread evenly through the entire surface of the bearing, and primarily the outer race - this will also avoid damaging the seal. ![]() ![]() If possible, support the bottom bracket on a wooden block while knocking in the bearings. The all-new SHIMANO ULTEGRA R8000 series crank features lightweight crankarms, a hollow outer chainring, and a wider gear pitch for increased clearance on modern road frames. The BB30 inner shell and crank spindle are usually aluminium, while the bearing races are steel, so copious amounts of grease can and should be used. If you’ve invested in the proper tools, skip to step 8. There are two ways to reinstall BB30 and BB86/92 bearings. How to fit BB30 and BB86/92 bearings without proper tools ![]() Inspect the bearings for any signs of unusual wear and try to diagnose the cause BikeRadar 7. ![]()
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