A free, unbiased bike-building tool with accurate data. Pick parts and see, in real time, whether they fit together, plus running price and weight.
First time here
Just start building
Pick parts and it checks them against each other as you go, with running price and weight. No account needed to build, check fit, or share a build link.
Not sure where to start
Get help getting started
Six kinds of riding described in plain words, each one opening the builder made for that kind of bike. No jargon, no account, no sign-up.
Been here before
Open your garage
Your saved builds, the parts you own, and what you’ve serviced, all in one place:
- Saved and completed builds
- The parts you already own
- Your service log
Your garage is private. Only you can see it.
Sent a build link?
Open it and the builder loads that exact build, every part ready to change. No account, no sign-up, nothing to accept first.
Four promises it makes, and keeps.
Nobody buys a verdict
No manufacturer pays for placement, ordering, or a favorable verdict. No affiliate links run on the site today, and none ever bias a result. If any appear, each one will be labeled.
Nothing appears that you didn’t ask for
No pop-ups, no newsletter walls, no cookie interstitials. A rule, not a preference.
An all-clear says what it means
“No conflicts found” means no conflict among the dimensions this tool checks, never a blanket guarantee of perfect fit.
“Verified” has to be earned
A ✓ is checked against the manufacturer’s own page, source and date linked. Everything else says sample data.
Every builder in the family sits behind Builders in the bar above, and the four promises apply to all of them.