Buying Used? Need a Tune-Up? Get the right fit?

I’m the guy!

“The Guy’s”  swag


Bling for you and your bike.


Assembly and shopping tips.

I Buy Bikes

Ready to sell your old bike?

About I Know a Guy Bicycles


Hi, I’m Justin and I’ve been working on bikes for over 30 years. I provide that perfect fit, well tuned (and affordable) bike to get you into cycling.

Happy Clients

“Justin is great to work with and very knowledgeable. He got my husband’s 20 year old Giant bike back up and running just like new!”

Kristi N, Loveland

“Purchased some pedals from justin on market place, was by far the fastest shipping seller I’ve ever dealt with.”

Casey B

Justin is fast and knowledgeable. He has tuned both my bikes several times, and I wouldn’t go anywhere else.

Cher Lulu S, Denver

Justin has tuned up several of our bikes. He does a great job and goes above and beyond to make sure you are road ready!

Jackaline R, Loveland