About Us

What is this thing?

This site makes it easy to:

  1. find a bike's geometry, and then
  2. compare it with another.

Anyone can add a bike, and you can now search by geometry numbers too.

Launched in January 2017 by two guys, it has quickly become the world's biggest open-access bike geometry resource.

In July 2017 we added the world's most complete database of bike fitters.

In early 2020 we reached 100,000 monthly unique users visiting the site, from all over the world. Still growing.

It's a spare-time project. Got feedback or ideas? Drop us an email: hello@geometrygeeks.bike.


A bike's geometry strongly influences its handling, your comfort, your aerodynamics and your power output.

Fit can have far more impact on performance and feel than expensive components.

Why on earth...?

You probably want to compare potential new bikes and your existing bike(s) before you buy.

Finding the right geometry chart for an older or second hand bike can be hard. It usually involves lots of Google image searches and not being entirely sure you've found the right model year.

When you do eventually find it, the information is never laid out the same way between brands. It's tricky to compare more than a couple of aspects without writing it all down.

Yes, there are bigger problems in the world, but we'll fix this one.

Who built it?

Bob Gray - Chief Bike Geek

Bob is good with bikes, and dabbles in code.

He loves everything on two wheels, and rides mountain, road and track. He's a planning manager for a biotech company.

David Toy - Chief Web Geek

Dave is good with code, and dabbles in bikes.

He's an experienced product and marketing manager for tech companies.

Can I help?

If you're a web developer and would like to help, give us a shout: hello@geometrygeeks.bike

If you'd like to help pay the hosting costs, click on an advert link before you buy some shiny new bike bits. Costs you nothing, gives us a few pennies!

Advertise with Us

If you are a brand in the bicycle industry we would be happy to have your ads on the site. We offer a display ad program with prime positioning and limited ad slots per page to ensure your ad gets the focus.


Building a website is about standing on the shoulders of giants. We'd like to thank:

Dave 'Pinnah' Mann

Dave started collating bike geometries in a spreadsheet from posts on mailing lists back when the web was still young.
He's kindly given permission for us to add that list to our database.

Dougie Shaw

Dougie is an experienced bike fitter, and has helped us understand some of the 'human' aspects of bike geometry and bike fit.
He has a website at edinburghbikefitting.com

The other web techies behind the scenes