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CORE Bike Fit
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Independent bike fit studio in Topsham, Exeter. Ride further, faster and without pain — on a bike set up for your body, not an average.

Book nowFree 30-minute chat

5.0 on GoogleIBFI Certified Fitter, Level 2

Knee 146°Live knee angle · target 140–150° at bottom of stroke
Knee — liveHip — liveSaddle pressure balanced

Choose your fit

The best option depends on your cycling, your body and your goals.

Align bike fit

£250

New to cycling, or riding without significant pain or injury.

  • Saddle height, fore-aft position and tilt
  • Handlebar width, reach and height
  • Cleat positioning
Book Align

Balance bike fit

£295

Higher-mileage riders, or anyone with injuries or discomfort.

  • Everything in Align
  • The benefits of insoles and foot activation
  • Saddle pressure mapping and testing
  • Crank length optimisation
Book Balance

Complete bike fit

£495

Riders with serious, long-term cycling issues.

  • Foot activation
  • One pair of custom footbeds
  • 12 months of ongoing support
  • Two follow-up visits within the year
Book Complete

Frame Finder bike fit

£250

Thinking about ordering a new bike.

  • Your position measured on the Purely Custom fit jig
  • Geometry to compare against the bikes you're considering
  • Guidance before you order
Book Frame Finder

Not sure which fit you need? Answer four questions.

Find your fit
Jon Underhill coaching a rider on the bike in the studio

Meet Jon

I’m Jon Underhill, an independent bike fitter and founder of CORE Bike Fit. My mission is to help cyclists of all abilities discover their Optimal Rider Experience — an individually tailored fit that enhances comfort, performance and enjoyment on the bike.

“I want to help as many people as I can enjoy riding their bicycles.”

Jon Underhill — founder, CORE Bike Fit

IBFI Certified Fitter Level 2 badgeMore about Jon

Why riders choose an independent fitter

Measured, not guessed

Video analysis, the Purely Custom fit jig, pedal analysis and Velometrik saddle pressure mapping help us make informed decisions about your fit.

Feet first

Jon would have been the fifth generation of master shoe repairers. The interaction between feet, shoes, cleats and pedals is the most overlooked part of any bike. #focusonyourfeet

Independent

Not tied to any brand or stock. Jon only suggests what he would use himself, chosen through research, experience and customer feedback.

Your bike fits you

You are the most important element of the fit. We work with your goals and issues to tailor the bike to you — not you to the bike.

Been there

Jon struggled for years with tight shoulders and neck pain on the bike, and used to grit his teeth and bear it. Now he knows the cause — and how to solve it.

Trained by the best

No averages or rules of thumb. Technology, experience and your feedback are used to prove each change has made a positive difference to how you feel.

The technology in the studio

Extra services

Thinking about ordering a new bike? We can help you find the correct geometry to make your dream come true.

Frame Finder bike fit

Working with G8 and SIDAS, we can craft a custom insole to get the best from your feet for your cycling.

Shoe fitting

We work with LORE, the world’s leading custom performance cycling shoe manufacturer.

LORE foot scanning

A custom 3D-printed saddle created from the way you actually ride. Fizik One-to-One uses dynamic pressure mapping to create a bespoke saddle with support and cushioning tailored to your personal riding data.

CORE Bike Fit is an authorised Fizik One-to-One dealer.

Fizik One-to-One custom saddles

We use a range of technology to make sure you are sitting comfortably in the right place, then use our saddle library to find the best solution for you.

Velometrik saddle pressure mapping

A free 30-minute in-person, video or phone call to understand your needs and guide you through finding the best solution — and to ask all the questions you have.

Book free consultation

Over time our bodies change through exercise and stress. If you have had a bike fit with us in the last 12 months and want to check everything is still right, book the annual tune-up.

Annual tune-up

Had a bike fit somewhere else and still not happy with your position? We offer a way forward without the cost of a complete fit. Please get in touch for details.

Contact Jon

What riders say

5.0 on GoogleRead all reviews on Google

  • “I had my first bike fit with Jon a few months ago and would definitely recommend. He made the whole process really comfortable and was great at explaining everything. The little tweaks he made to the bike made a huge difference when riding.”
    Louise AndersonGoogle review
  • “I typically ride between 10-20 hrs a week, so a good bike fit is very important to me. I came to see Jon after a long term issue that had been causing significant instability and symmetry issues, that was affecting my enjoyment of riding and racing. … He goes above and beyond to make sure no stone is unturned, and we find the real problem, and not just treat the surface symptoms.”
    Ned LockeGoogle review
  • “Excellent shoe fitting along with some really good advice about how I can correct my left side dominance. Can’t wait to get riding in my new Lake shoes!!”
    Martin RandallGoogle review
  • “When meeting Jon, he was incredibly knowledgeable and highly professional throughout our discussions making informed diagnoses and considered suggestions along the way. … As such, there was never a heavy sales pitch regarding a new set of more suitable cycling shoes that would aid with the injury, but a carefully considered potential solution.”
    John ClampGoogle review
  • “Absolutely amazing. Cannot say enough great things about Jon. Super professional, super helpful!”
    Jude OnodyGoogle review
  • “I had my first bike fit and it was an excellent experience. Jon was incredibly knowledgeable, taking the time to explain every adjustment and the reasoning behind it. His expertise was matched by his kindness and patience, making the whole process comfortable and enjoyable. … Highly recommended.”
    Etienne PhillipsGoogle review
  • “Core Bike Fit was a great experience, especially as this was my first proper bike fit. Jon was brilliant—really friendly, easy to talk to, and clearly knows his stuff. … The whole session felt relaxed but really thorough. Would definitely recommend.”
    Rob CottonGoogle review

Hear Jon talk about fitting

Listen to CORE Bike ChatRead the Cyclist feature

Visit the studio in Topsham

16A Fore Street
Topsham, Exeter
Devon EX3 0HF
Book nowFree 30-minute chat
Book nowFree chat