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So, the stupid design of the Genesis Fortitude forks means that the rotor bolts on my wheel hit the fork leg.
I've currently solved it by changing the forks, but I'd rather put the originals back on.
Getting a new wheel with a centre lock would sort this, but I don't want to buy another wheel. I have a Hope one I could potentially demote (it's a single speed hack) to this bike which JUST clears the forks. I mean the gap between the rotor bolts and fork leg is literally one millimeter maximum. Possibly less.
So what sort of clearance is required here? I can't imagine there's any significant flex at this point, and you don't need mud clearance down there, but still the tightness worries me...
What bolts are you using? There is a big difference with the heads - hex can be 4mm or so, regular Torx button head more like 3mm or you can get very low profile Torx heads more like 2mm or less. That should sort it.
Already done that unfortunately, I'm running the most low profile torx bolts I found in my cupboard and can't see anything more low profile is possible. I've even tried those triangular bolts, rotated to get the most clearance (which meant un-ideal torque so another problem!)
That's really odd - the rotor position is obviously an ISO standard so the Forks should have enough clearance regardless??
1mm is fine I'd say, there's not going to be any flex or stuff falling into the gap.
Might countersunk help?
Clearance is clearance, init? Assuming it doesn't become interference with any flex, you're fine. Check for scrapes occasionally or any strange noises, but 1mm sounds like ample
That’s really odd – the rotor position is obviously an ISO standard so the Forks should have enough clearance regardless??
Yes, it's really weird that they'd design them like this. I've just noticed that it only seems to be the Adventure model that has this problem. The dropouts are different, on the other models they're welded toward the inside of the fork legs like this:
On mine, the dropouts are centred on the legs, like this (best pic I can find on google):
Annoyingly that pics shows a 6-bolt rotor clearing, perhaps I'm unlucky that the two wheels I tried on my forks were both catching. Or perhaps my forks are just a little off for some reason.
Washer between the bearing cap and the fork dropout?
local machine shop skim 1mm from the rotor mount face ?
1mm is fine I’d say, there’s not going to be any flex or stuff falling into the gap.
Might countersunk help?
Not sure I've ever seen countersunk rotor bolts?
You may be right that the current clearance is OK. Thing is I'm just not sure it's even 1mm, and even the clearance that's there is partially due to a small bit of missing material from when I first installed a wheel and span it thinking it was caught on the disc brake...
Washer between the bearing cap and the fork dropout?
This could work. I just didn't like the idea TBH, it terms of wheel security.
This could work
But what isn't working just now?
What might get into the gap?
But what isn’t working just now?
What might get into the gap?
Currently it works as the Genesis forks are under my bed and the bike has some Salsa one's one 🙂
The wheel I have on now won't fit in the Genesis forks without the bolts catching. If I put a washer on the axle than it spins with barely visible clearance. If I put a Hope hubbed wheel in then it clears without a washer, but again the gap is really miniscule, too small to measure.
True, I can't imagine anything getting in the gap, but I still find it slightly concerning... I'll take a pic when I can get around to it.