One of my lads has bought himself some nice Hope M4's to put on his Bighit. The front fork is a 2010 Boxxer & we bought an "H" mount thinking this was the correct one for the job. See pic below.
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As you can see, the caliper is at the wrong radius for the 183 disk 😥 I could modify the mount but would rather have the correct one. I've also tried the Avid 183 post adaptor & it's not the correct one either. Any ideas what we've done wrong ?
looks fine to me apart from a few mm - you sure you've not got a 180 rotor on the front?
looks fine to me apart from a few mm - you sure you've not got a 180 rotor on the front?
Worth checking, I'll have a look. (Defo ordered as a 183) & mount to suit.
Edited to add. Definitely a 183 rotor.
D.
iirc, boxxer mount is different - you need a 203mm rotor and the Boxxer mount, HMBD
Available from us (and all other good Hope stockists) 😉
The pre 2010 Boxxers used a specific mount. The 2010+ forks use a standard 74mm (6") post mount.
That looks like a mount for a 185mm disk - the Avid one also won't fit as they rely on the 'top hat & shim' to make it work.
silly 18bikes 😆
18Bikes. Thanks. That explains a whole lot. Head scratching over 😀
Muckle thanks, Dave.
Oops - my bad, maybe I'll read the question and LOOK AT THE PHOTO properly next time!
Is it sat too far out - a quick google suggests they direct mount PM 180?
Yup, too far out by approx 3-4mm. Confusing the issue is that the Boxxer mount has changed over the years, at least once. I'm going to call Hope again next week. I might have to resort to the lathe, I'm running out of patience with this thing 🙂
Cheers D.
If it's a 180mm direct mount and a 183mm rotor, a couple of washers between the caliper and post mounts and no adapter should work, maybe?
Stupid question, but I assume you have tried flipping the mount the other way up?
I just looked at mine & the top section of the mount/caliper bolt is nowhere near that far out, and i'm running a 203mm rotor.
I've just looked at my missus bike and its the same set up as yours, 183 rotor with H mount onto a boxxer and theres about 1mm where the pad clears the rotor face, where as yours looks like 3mm. Have you checked that part of the pad hasn't gone missing ?
I can sell you the caliper half to fit a 203mm or swap for your caliper half!