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I have bought a 2nd hand 26 Bfe frame that can take a 27.5 fork.
on the site it states the geometry for a 120mm 27.5 and a 140mm 27.5 fork and a 26 inch wheel
A lot of the fork options for 27.5 come as boost - i also happen to have a spare 27.5 boost front wheel.
Wondering if its madness to have a 27.5 fork at 130mm and 27.5 wheel. i think the numbers state
"Net axle height change ≈ +25 mm (wheel radius gain) − ~7 mm (axle-to-crown loss for 10 mm less travel) ≈ +18 mm higher front axle vs Cotic’s quoted numbers."
Head angle: Slacker by roughly 0.5–0.8° (depends on frame size and HTA).
This is a small frame for my kid
BB height: Increases by about 10–12mm.
Reach / effective TT: Feels a touch shorter (since slacker HTA pushes bars back slightly).
Or i need to get hold of a front hub adaptor for a tesla superstar hub (think its same as nukeproof 3 in1) to accommodate a maxle or 20mm which is on a 26 wheel
Wondering if its madness to have a 27.5 fork at 130mm and 27.5 wheel.
If that’s what you have… whack it on and see. Depending on how old/tall your kid is, I’d be thinking about standover height more than angles and handling. Build it up… stand ‘em over it. If you’re buying bits, and your kid is only just big enough for this bike, I’d go shorter fork.
The A-C differenece should be ~half an inch (basically the radial differnce between a 559 and 584mm Rim). plus another 1/2" for the Wheel so yeah, front end jacked up by 1" (Static)
Realistically you're talking about the rough equivalent of having a 10mm longer travel fork, barely noticable to most people, and easily addressed by playing with spacers/Stems/Bars... And then the fork sags reducing the effect.
Honestly if you don't tell/explain the differnces to Junior I seriously doubt they'll even notice any difference.
BB height: Increases by about 10–12mm.
You Sure about that? I'd plug it all into BikeCAD and see what it says.
It’ll be absolutely fine.
What Kelvin said, if you've got the bits try it.
The calculators will only tell you so much, riding it will tell you a lot more!