As per title really. Is there an app that I can take a pic of my bike and it'll give me all the measurements, that I can then transfer to another bike?
You take a photo and it works out the distances to the nearest mm?
I very much doubt it.
You have three contact points so just need to know the two you can move (saddle and bars) relative to the one you can't, cranks.
You only need 4 measurements:
- Height of the saddle above the BB centre
- How far back the saddle is from the BB centre
- Reach - from saddle to bars
- Drop - from saddle to bars
Then assuming the cranks are the same length on the new bike, you can reproduce the same fit by just getting the saddle in the same position relative to the BB and getting the bars in the same position relative to the saddle.
It would need a scaling reference, rim diameter maybe?
Of you could just use a tape measure and bang the numbers into excel...
you could just use a tape measure
This
I'm guess the last two replies haven't done this much. Sometimes, especially when on your own, "just using a tape measure" isn't convenient, although it usually isn't that hard and will probably be the most accurate.
I was curious about this, as I've struggled recently mapping my road bike fit to my turbo bike.
DC Rainmaker reviewed the Bike Fast Fit app way back in 2013, and seemed to give generally good review. I note on the app store it hasn't been updated since 2018.
https://www.dcrainmaker.com/2013/10/automated-measurement-review.html
I'll take one for the team and download and try it out - curious if it is a good solution. I'll try to remember to post back here in a few days.
https://apps.apple.com/gb/app/bike-fast-fit/id710935084
“just using a tape measure” isn’t convenient, although it usually isn’t that hard and will probably be the most accurate.
Convenient, hard, accurate. Pick any two.
Convenient, hard, accurate. Pick any two.
Convenient and accurate please 😉
“just using a tape measure” isn’t convenient
Really?
Using a tool specifically designed for measuring things, to measure things, is "inconvenient"?
You've probably expended more effort looking for the perfect app than it would have taken to take measurements and jot them down...
Simply moving measurements over from one bike to another doesn't replicate fit like you think it will.
Slight angle changes in frames change how your body sits in relation to things.
Which is why folk move measurements like for like and find the bikes still a bag of shit or worse still spend hours comparing manufacturers measurement charts like they know what they are doing and still end up with a bag of spanners
If you measure the right reference points you'll end up sat in the same position with the same contact points, regardless of how they are joined up by frame and bars. Frame angles might make a difference to how you have to then ride that bike, or position yourself in the saddle. It's probably more of a dynamic thing for MTB than road.
I downloaded an app a while back which says RBF 2.1 on the icon. You take photos of you on your bike and input static dimensions including the distance from the camera. Never tried it so I can't comment on how good it is though
Trail_rat's basically right. Unless your wheels are also in exactly the same place relative to the BB why would you set your position up to be exactly the same? A bit of variance is fine, muscle memory is easily overcome etc and it's about fitting yourself to the bike to get the best from it as well as vice-versa.
Unless your wheels are also in exactly the same place relative to the BB why would you set your position up to be exactly the same?
Because your limb lengths are exactly the same. If you have the optimum peddling fit on bike 1, you need the same relative saddle / BB position on bike 2 otherwise your stroke will be different. Likewise your reach is just the same, so you want the bars in the same place relative to the saddle.
There are exceptions, you would have a different fit for a traditional road bike and say a TT bike, where you would be going for different 'fits' based on the application.
jenson bike fit is a page on jenson bikes (usa) it takes about 6 or 7 body measurements and gives you various measurements to size and fit your bike. i find it quite good when setting a bike up initially for a new rider.
Because your limb lengths are exactly the same.
Fair.. or you'd hope so : ) For most of us bike fit is about handling as well? If we're talking about generic/trad road race bike geo then yes, but as you say as soon as you get into bikes that need different weight distribution to handle well or stem to top tube/reach ratios change etc it may be as counterproductive as it is helpful. That's not the fault of a fit app though, just about how someone uses it. Though if someone needs a fit aspect maintaining due to injury that changes it all.
Are you going from like to like? Because as mentioned above, the position on a road bike vs a TT bike or a 130mm FS vs a HT is going to be quite radically different as is the geometry.