ETZ250 front brake

[tigcraft]

Can anyone tell me what the gap is supposed to be between the front disc and leg as mine is uncomfortably close?

[Blurredman]

I've also looked for such info and never found...

Both my bikes the discs are so close you'd swear they were touching!

[tigcraft]

Probably not what I wanted to read but I think your bikes are correct in how they should be therefore mine must be right too as it’s the same.

[Puffs]

A 0.95mm feeler passes easily between the fork leg and the support part of the disk on my 251 (which I believe is the same as the 250).

[tigcraft]

Ok so mines about right. Why on earth would any bike maker build something with nearly zero clearance beats me best of all MZ?

[DAVID THOMPSON]

the boys did not want to build a whole new fork
they wanted to fit a disk
and it worked with out a new wider set of fork clamps a longer axle and spacers for the front fender

do not get a plastic shopping bag caught in it at speed

[tigcraft]

Even with that I still scratch my head.

[Puffs]

Good question. Maybe there is an engineering reason, for instance that the farther you offset the disk from the fork leg, the more torsion torque (trying to rotate the fork around the length axis) it gets. True, that axle is a bit thin, but even so, quite massive & heavy. Maybe they calculated in that direction and choose this small offset?

Indeed, elsewhere you see more, from reputable manufacturers, and such a small gap would give problems offroad. But all the other bikes I looked at have much bigger D hollow axles.

[dave47]

They must have just figured a gap is a gap.
For road use it only becomes a problem if corrosion sets in between the steel disk and the alloy holder. It forces the alloy to rise and foul the fork leg, so you need to keep the junction protected with paint.