20" Wheels with 14mm Axles and Disc Brakes?

jimcroisdale

Hi all,

First post here - hoping you can help me!

I'm building a gravity racer and am looking at the kind of wheels I need. Essentially, the spec is looking like:

- 20"
- 14mm axles (not 3/8 as they are not strong enough to handle the lateral loads)
- Disc brakes

Is this a beast that I can get off the shelf, or am I going to need to be lacing BMX rims onto MTB hubs and other tomfoolery?

Regards,

Jim

The Rookie

You'll be building your own....do you mean 15mm axles?

rockmonkeysc

Bigger axles are good for reducing twisting in forks which I wouldn't have thought would be an issue in your application.
The main thing you want is super stiff rims. Discs might be easier to mount on the axle. You're going to find it difficult to run four brakes off two levers, you'll never get the fluid displacement you need.

jimcroisdale

The Rookie wrote:

You'll be building your own....do you mean 15mm axles?

From what I've seen, axles are either 3/8" or 14mm, and I'll need the 14mm ones as I'm using stub axles, so the wheel is only supported from one side.

That's also why I can't mount the discs on the axle - the axle won't be rotating.

Cheers,

James

The Rookie

Not heard of a 14mm standard for bikes, fronts would be 9,12,15 or 20mm.

larkim

Seems its a BMX thing

https://www.google.co.uk/search?q=bmx+s ... m+bmx+axle

So if BMX 14mm axle is a requirement, then BMX hubs would be required.

jimcroisdale

15mm would be fine also - it's just a question of strength. At 3/8in i couldnt get an axle strong enough to support the wheel at only one side.

20" wheel, 14mm (or thicker) axle, disc brake mount.

Anything out there?

Cheers,

Jim