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Before installing any threaded bottom bracket (BB) it is vital that the bottom bracket shell is faced and the threads are chased by a professional bicycle mechanic
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Debris in the threads can damage both the frame and BB
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A misaligned BB shell will lead to premature bearing wear
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A BB shell that is too wide can cause damage to the crank and BB. Even a BB shell that is only 0.5mm too wide can cause problems
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Most good bike shops will have these tools and understand that this is an important part of frame prep
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Now that the BB shell is prepared, measure it to ensure that it is in spec and to determine the number of spacers needed under the BB
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BB shells should measure exactly or slightly under 68mm, 73mm, 83mm or 100mm depending on your frame, check with your local shop if your measurements are off before proceeding
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Determine the number of BB spacers needed using the chart
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Lightly grease frame and BB threads
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Install the center tube into one side of the BB before installing
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Install prescribed spacers on BB cup and thread into the frame
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The drive side cup will be reverse (left hand) thread
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The non-drive cup will be a standard (right hand) thread
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Install the non-drive side BB cup making sure the center tube is properly aligned
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Using the e*thirteen BB tool in conjunction with a 10mm hex bit and torque wrench, tighten the BB cup to 34-41nm
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Determine the number of spindle spacers to use by referencing your crank model and BB shell width using the chart
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How to install legacy cranks using the wave washer and spindle spacer preload system
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Thanks for reading, now get out there and ride!
Thanks for reading, now get out there and ride!