- Everything here is free and provided as information, not as a professional fitting or mechanical service.
- We work hard to be accurate — and the limits printed on your components still win.
- Never exceed a rim's or tire's maximum pressure, or a part's torque spec. Those rules outrank anything a calculator tells you.
- Your bike and your riding are your responsibility. We can't see either.
Who these terms are with
PedalToolbox (pedaltoolbox.com) is operated by Hamilton Digital Media Limited, registered in England and Wales under number 15608219, registered office 13a Mill Lane, Wimborne, Dorset, BH21 1LN, United Kingdom. In these terms, "we" and "us" mean that company. By using the site, you're agreeing to what follows.
What this site is
A set of free calculators for cyclists — tire pressure, gearing, fit, training and riding physics. There's nothing to buy from us, no account to create, and no subscription. You can use the tools for your own bikes, or for bikes you work on professionally, at no charge.
What we promise about the math — and what we don't
We take the numbers seriously, because they're the entire point of the site. The physics comes from published models and standards — the Martin power equation, ETRTO rim standards, the Coggan training zones — rather than copied from someone else's table. All the calculators share common calculation engines, so they can't disagree with each other. Those engines are covered by an automated test suite that includes real-world validation pins, and every result has a "show the math" panel so you can follow the arithmetic yourself.
What we can't do is see your bike or your body. A calculator only knows what you type into it, and every fit and pressure output here is a starting point, not a prescription: individual bodies, components and roads vary more than any formula captures. You remain responsible for sanity-checking a result against your components' printed limits and your own judgment before acting on it. If a result looks wrong, it might be — please tell us.
- Never exceed the maximum pressure printed on a tire or rim — whichever is lower wins. Hookless rims are capped at 72.5 psi regardless of what any calculator suggests.
- Torque specs are limits, not suggestions — especially on carbon parts. Use a torque wrench on anything structural.
- Safety-critical work belongs to competent hands. Brakes, steerers, wheel builds and carbon repairs deserve a professional mechanic if you're not certain.
- Make one change at a time and test-ride gently. Fit and pressure changes reveal themselves at speed; find out in a parking lot, not a descent.
- Manufacturer instructions win. If a maker's documentation differs from anything here, follow the maker.
This isn't professional or medical advice
The site is general information, not tailored advice for your body or your bike, and using it doesn't create a professional relationship between us. Fit numbers are geometric starting points, not treatment for pain or injury — persistent pain on the bike deserves a professional fitter and, where it's your body rather than the bike, a medical professional. Training tools (FTP, zones, training stress) are arithmetic on numbers you supply, not coaching or health guidance.
What stays your responsibility
- Checking the printed limits on your tires, rims, and components before applying any number from this site.
- Measuring honestly — inseams, weights, and battery sizes a calculator is only as good as.
- Riding within your ability, your local traffic laws, and (for e-bikes) your local class regulations.
- Having safety-critical work done or checked by someone competent to do it.
- Deciding whether a given result makes sense for your bike before acting on it.
Links to other sites
We link out to retailers, manufacturers and reference sources. Some of those may be affiliate links, explained in full in our affiliate disclosure. We don't control other websites and aren't responsible for their content, their products, or their privacy practices — once you leave here, their terms apply.
Content and copyright
The writing, design, code and calculator implementations on this site belong to us. You're welcome to use the tools, quote us with credit and a link, and print or save results and charts for your own use. Please don't republish our articles wholesale, copy the calculators onto another site, or scrape the site automatically.
To be clear about what we're not claiming: the underlying physics and fit methods are public knowledge and nobody owns them. The Martin power equation, gear-inch conventions, the LeMond formula and the ETRTO standards are free for anyone to use — it's our particular expression of them that's covered.
Availability
We aim to keep the site up and current, but it's provided as-is. We may change, move or retire tools and articles, and we don't guarantee uninterrupted access.
Liability
To the extent the law allows, we're not liable for loss or damage arising from your use of this site — including damage to a bicycle or its components, purchases made on the strength of a calculation, or losses from acting on a result without checking it against your components' limits.
Nothing in these terms limits or excludes our liability for death or personal injury caused by our negligence, for fraud, or for anything else that can't lawfully be excluded. If you're a consumer, you keep all the statutory rights you have where you live, and nothing here takes them away.
Governing law
These terms are governed by the laws of England and Wales, and disputes fall to its courts. If you use the site as a consumer somewhere else, you keep the protection of any mandatory consumer law that applies where you live.
Changes
We may update these terms as the site grows. The date at the top of this page shows when they last changed materially, and continuing to use the site means the current version applies.
Contact
Questions about these terms: [email protected]. Something here that's factually wrong: [email protected].