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650b Wheelset for Cannondale 2019 Topstone Carbon

I have the Cannondale 2019 Topstone Carbon RX2, and want to get a set of 650b wheels to swap in/out of for tougher gravel. I understand there are some specifics regarding the Ai bb and potential re-dishing, and staying with centerlock brakes to avoid adjusting the disk brakes. Can anyone recommend a good setup for easy swapping in/out of wheelsets? Thanks! 

6 Replies

@wstark Thanks for reaching out!

We're going to tag some of our techs here to see if they can weigh in and answer your question for you. If you don't hear back soon, feel free to reach out to and they should be able to get you the info you're looking for. Thanks!

@REI-AliciaG @REI-CassidyT @REI-JacintaH @REI-JebM @REI-JessieD @REI-MeganR @REI-ReinkeM 

At REI, we believe time outside is fundamental to a life well lived.


I also have a Topstone Carbon 105 and would like a second wheelset- either 650b or 700c. I’d love to hear options to make swapping out wheels and tires easy, given the AI offset and disc brakes.  Thanks.


following this for any updates


@wstark @Thaddeus77 @DividendMadeMeDoIt 

Thank you for your patience and we apologize for the extensive wait on this information. We have reached out to our friends at Cannondale and we hope to have this information for you soon. We will circle back with you here in the community as soon as we know more.


At REI, we believe time outside is fundamental to a life well lived.

@wstark @DividendMadeMeDoIt @Thaddeus77 

Thanks for your patience as we tracked down this information for you. We heard back from our friends at Cannondale and here is what they said:

You can easily add 650b wheels to the Topstone Carbon. Most wheelsets can be added as long as they are the right axle spacing. Here are the only restrictions to going 650b on a Topstone:

  • Tire size is 650x48 measured size. With the vast amount of rim widths and tire dimensions, it is best to use a tire's measured size when pressurized.
  • The rear wheel needs Ai Dishing on the rear wheel. This is a 6mm dish to the non-drive side (NDS) of the bike. Nearly all standard spoked and nipple wheels can be dished this way. 

If you are not confident performing the dishing work to the wheel on your own, we recommend connecting with your local REI bike shop. Our techs are ready to help!

The Cannondale team also included some notes from the 2020 Cannondale tech book for the 2020 Topstone Carbon:

Cannondale Topstone Specs.png

Hopefully this helps, thanks!

At REI, we believe time outside is fundamental to a life well lived.

Hi @REI-JohnJ Thank you for the reply! I appreciate the  help.