Contact Us

Have a question on sizing?  Need help choosing gearing or wheels?  Here are three easy ways to contact us:

  • Call our hotline at 1-855-559-5659 between 10am-3pm PT on weekdays, or leave us a message any time.
  • Schedule a call with us at your convenience.
  • Drop us an email at, or fill out the form below.

You can also check out our FAQ or our bike size guide.


We're here for you.

Meet the friendly bike experts at Thesis who are here to answer your questions:

Patrick Carey is a professional coach and bike fitter who has helped countless Thesis riders dial their personal custom fit and spec. Meet Patrick.

Sam Jackson is a lifelong rider and professional mechanic who is always happy to talk about bikes. Meet Sam.