Italian-threaded 70mm bottom bracket shells are the odd one out in the road world — most modern frames use BSA 68mm or T47, so if you're building or servicing a frame with an Italian shell, your bottom bracket options narrow considerably. The SRAM DUB Italian Road 70mm bottom bracket is made for threaded 70mm ITA road shells and works with SRAM DUB 29mm cranks , and this Wide version ships with the specific spacer kit needed to run DUB Wide road cranksets in that shell.

Wide cranksets have a spindle that is 5mm longer than standard cranksets, so you will need the appropriate bottom bracket spacers for your application. The correct spacers for DUB Wide depend on your bike frame's frame shell dimensions, and the spacers are included when purchasing the correct bottom bracket. That's the important thing to understand about the Wide designation here: the bottom bracket cups themselves are the same as the standard DUB Italian 70 — SRAM even uses the same part number (00.6418.038.000) for both — but the box includes the wider inboard and outboard spacers you need to properly position a Wide crankset in a 70mm Italian shell.

The Wide option is designed to provide frame designers with approximately 2.5mm of extra space on each side of the bottom bracket. By shifting both crank arms outwards by 2.5mm, this additional space is created, primarily on the drive side where the chainrings are located. In a standard road bike crank, the chainline is 45mm, while the Wide crank increases it to 47.5mm. As for the Q-factor, a standard road crank has a measurement of 145mm, while the Wide crank setup increases it to 150mm. That widened stance is what lets modern endurance and gravel-adjacent road frames clear larger tires without giving up short chainstays.... Read More