Ask a Mechanic: Specialized OSBB and BB30 Compatibility

Welcome to our Ask a Mechanic column where our expert mechanic Daniel Slusser answers your bike maintenance questions. If you have a question for Daniel, please post it on our Facebook Wall or e-mail Daniel directly at 

SRAM X01 GXP Crankset

SRAM's GXP crankset can be adapted to most frame bottom bracket standards.

Question: First of all, I would like to thank you for your very clear and great interventions on the blog. This is really helpful.

I have a riddle I am unable to solve. I own a Specialized Stumpjumper FSR Carbon Expert 2011 with a OSBB (84.5mm). I would like to install the latest Sram X01 crankset in BB30 version. Do you think it can be possible if is the housing is too wide for the Sram XO1?

I wish you a Merry Christmas! Very grateful for your help. From: Chris in France

Race Face Narrow Wide Ring

With Race Face's beautiful anodizing you can practically taste the rainbow.

Answer: Thanks for the compliments Christophe. Unfortunately a BB30 X01 crankset will not work with your bike. Here is what Specialized had to say about it (click on the link for a compatibility chart). I checked with my friends at SRAM’s crank and chainring research and development office here in San Luis Obispo and they said it was a no go as well. A SRAM GXP X01 crankset is what you need.

Keep in mind that there are a lot of good narrow-wide X01/XX1 style 104mm bcd chainrings on the market at the moment that you could add to your existing crankset. If you are into accessorizing your bike with color, the Race Face Narrow-Wide is the way to go. We also have the new e*thirteen Guidering M Chainrings that are a bit thicker/tougher and offer adjustable chainline. If you want to stick with SRAM, they make a 104mm X01 chainring that is available for purchase separate from a crankset.

Daniel Slusser is a professional bicycle mechanic with over ten years of experience. He holds a bachelor’s degree in business administration from HSU and a master’s degree in history from Cal Poly. When he is not riding, wrenching, or writing he enjoys spending time with his wife and two children.