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Hi brain trust.
I’m trying to drop my faithful Hope Mono 8 Mini’s onto my Specilized Camber Evo 2015. I bought it second hand and the front post mount callipers w/ 180mm rotors have already been upgraded to 203mm rotors with the same stock Shimano BR-M615 callipers. I removed a PM to PM adapter—that has 40mm written on the back of it—and based on what I had laid around tried a PM to IS adapter ‘HBSM20H’ and installed the front IS Hope Mono 8 Calliper.
This positions the calliper too far out with only half of the pad making contact with the rotor.
My logic so far. If the stock rotor was 180 but upgraded adapter I removed was a +40mm adapter then I would presume the original mount (sans adapter) to be 160mm. I would presume the HBSM20H Hope adapter I installed to be +20mm at the most, but the new calliper position is too far out. The mount can only be mounted one way with the calliper. I also tried another IS mounted mono mini I had laid about, and that seemed too small by a few MM’s. I’m wondering if effectively the Mono 8 Mini I’m trying to install already has a ‘+___’ as part of the machined piece and is designed to be mounted only on IS. It came off a RS Pike IS mount running a 203/205mm rotor without an adapter.
Can anybody please give me any suggestions as to what I should be trying next? Or if this is the end of the pipe dream.
Matt
Hope made various calipers for different IS mounts without adapters, so it's entirely possible.
If I were you I would get some washers/shims and use the smaller caliper and space it out on the post mount interfaces until the caliper clears the rotor (assuming we're talking just not clearing rather than "still 5mm away from lining up".
There were also 150mm and 170mm versions of IS-post adapters, I think shimano did a 170mm rotor for that scenario.
Hope #8 caliper is for IS Front with a 205mm rotor. Back in the day to change rotor sizes with hope brakes you fitted a different caliper half.
Yes, 205 is the number I had in my head from when I first got these c.10 years ago. So combining you posts I suspect this is never going to fit to this frame. Shame.
I did spot that my rigid had flat mount Hope ‘Race’ callipers of some description, so I guess they’re going on the big bike providing I can find the right mount adapter to get the rotor size up from the 180 it’s on now.
Thanks for your inputs
I’m assuming you are talking about an original 2piece mini as apposed to a “mono” mini, as I didn’t think they did an No8 in that one (black and gold). Do you have a pic of that hope adapter? as I’ve not seen a post to is hope adapter before. The problem you have is the adapter is going to add 20mm to your rotor so you are actually set up for a 225mm (No8/205 + 20mm adapter)what you need at a No3 caliper with that adapter or you could try one of these:
https://clee-cycles.co.uk/P1043/product
Not used one myself but found it while looking a while ago. They offer a no question return if it doesn’t fit so all you could lose is time.
Don't know if this helps - I am running that ‘HBSM20H’ adaptor with my 2008 Mono-Mini's and a post mount RS Reba. I found it hard to track down the adaptor at the time so wrote to Hope - who as always for me were very helpful\patient!
This is what I wrote:
I have been running Mono Mini Pro’s on 160mm rotors for a number of years and am very happy with the performance. The front is currently on an old Rockshox Reba with IS mounts, so direct fit.
I have replaced my fork (with a 2014 Rockshox Reba – max rotor size 210mm) and need to find the appropriate postmount adaptor.
This was their reply:
You can fit your Mono Mini caliper to a post mount fork by using mount HBSM20H but you will have to increase the rotor size to 180mm (perfectly acceptable for trail riding). Also, the top cap will work fine.
THis is still running fine btw - but 180 is the biggest rotor that would fit too. Anyway hope it helps on some level!
The mono M4s I have were for 180/160 rotors bit there were loads of options for caliper sizing. Before you do any more can you still get spares for this vintage Hope kit? Would be a shame to chuck time and effort at it and then find it was wasted for a leaky seal in six months time.
Maybe clearer info 🙂
https://www.hopetech.com/_repository/1/documents/Brakemounts2019V2.pdf