I’m planning to order a custom frame with this geometry.
I’ll use it for aggressive street riding and crit races on kart tracks.
The material will be 7005 aluminum.
If you have any opinions on the design, I’d love to hear what you’d change for this kind of use.
Any feedback before I send this to a builder would be appreciated.
by SuperTrofeo2008
8 Comments
Holy toe-overlap.
It’s tough to minimize on a small frame and it’s not an issue racing, but I am so glad I can ride something with enough front-center to keep it at a minimum.
So many questions….
First and most importantly….what are you basing your spec from?
What inspiration made you choose the bb drop and tube lengths etc?
302mm seems kind of high for a BB height. I prefer something closer to 280-290mm. Also the front wheel and pedal looks very close together, I would want less toe overlap. Your toe will surely rub against your tire whenever you turn
Also why so much seat tube above your top tube. Seems like extra weight for no reason.
you may want less toe overlap for street riding and kart track crit riding. You’re gonna have to pedal through turns
1. What fork? It looks like you can only fit 28-30mm tires which won’t be good for crit racing, and if your fork rake is super low the handling will be horrible at higher speeds
2. 35mm BB drop will make you unstable in corners, which again is not great for crit races
3. Wheelbase is tiny which makes it generally more unstable, and your weight distribution is leaned towards the front wheel
4. Toe overlap is awful unless you’re going to run 140mm cranks
Overall I would not have this built unless you only plan to ride under 20mph
Did you work with a fitter first? If you didn’t, spend a few hours with one and have them check whether these numbers will work for your body.
Custom frames are rad when they’re bespoke to your body, less so when you’re just guessing at numbers on a screen or copying something that’s already in production.
Give your bike fit numbers to the builder and let them work out the BB height, front/rear center balance, etc. They’re the experts, or at least they should be. A lot of people can weld tubes, far fewer can make a bike that fits and rides like a custom suit.
The builder will have an opinion too, and I think theirs is much more valuable right now