PM Adapter frustrations

Jeffsy29

Member
May 6, 2020
182
79
Rockville MD
Magura Caliper adapter needed upgrading from 160 PM on Orbea Vibe

I know the Vibe isn't an mtb, but hopefully some of you folks with Magura experience might know the answer. The Vibe is Orbea's urban bike and comes with a post-mount caliper and 160mm Magura rotor. A little weak for my mass. I'm looking to upgrade to 180 or even 203mm, if possible.

The fork comes with the QM 40 adapter already installed to accommodate a 160mm diameter rotor. But looking at Magura's chart, it implies that adapter would take you from 160 to 180 mm. If QM 40 is required just to get to reach 160mm, I'm wondering what's needed even to get to 180mm?

The chart is confusing as it recommends QM 42 for 160->203mm, but that can't be the case if QM 40 only gets me to 160mm. Is 203mm out of the question given this chart of adapters? Does anyone 'piggyback' adapters to get from 160-203mm or is that just sketchy?

Can anyone make sense of this chart, and would I use QM 42 for a 180mm rotor?

Screen Shot 2022-12-06 at 9.10.35 AM.png IMG_5945.jpg IMG_5944.jpg
 

Attachments

  • magura-adapter-ov-en (1).pdf
    216.9 KB · Views: 88

Spangoolies

Active member
Nov 5, 2022
122
113
UK
By the sounds of it your forks are pm120 so designed for a 120mm rotor without any adaptors. Problem is the chart doesn’t go that small. You’re looking at a front +60mm pm to pm adaptor. I would be checking with the fork manufacturer if your forks can safely take an increase of that much.
Double adaptor is very sketchy.

Edit: I read the table wrong. The numbers on the adaptors do not relate to the size increase.
 
Last edited:

Jeffsy29

Member
May 6, 2020
182
79
Rockville MD
By the sounds of it your forks are pm120 so designed for a 120mm rotor without any adaptors. Problem is the chart doesn’t go that small. You’re looking at a front +60mm pm to pm adaptor. I would be checking with the fork manufacturer if your forks can safely take an increase of that much
@Spangoolies - I'm assuming the mfg. is Orbea...they call it "Orbea Vibe Carbon Fork" on the spec. sheet. I guess I'll try their tech support. I didn't think about fork strength as a limiting factor but I suppose the torque has to come from somewhere.
 

Spangoolies

Active member
Nov 5, 2022
122
113
UK
Sorry, just looked into this further, strangely the qm40 is only a +20mm adaptor so your forks are 140mm rotor size standard. Adding 40mm shouldn't be too bad but best to check if you can as they are carbon road/hybrid forks. Also the vibes that I’m looking at says that the forks are flat mount? but that doesn’t make any sense as the qm40 adaptor that you have is post mount to post mount and they look like post mount fittings in your picture. Different model vibe to the ones I’m looking at maybe? So by the sounds of it all you need is a magura qm45 adaptor as that looks to increase by 40mm and is the same fitment as the one you already have
 
Last edited:

Jeffsy29

Member
May 6, 2020
182
79
Rockville MD
Sorry, just looked into this further, strangely the qm40 is only a +20mm adaptor so your forks are 140mm rotor size standard. Adding 40mm shouldn't be too bad but best to check if you can as they are carbon road/hybrid forks. Also the vibes that I’m looking at says that the forks are flat mount? but that doesn’t make any sense as the qm40 adaptor that you have is post mount to post mount and they look like post mount fittings in your picture. Different model vibe to the ones I’m looking at maybe? So by the sounds of it all you need is a magura qm45 adaptor as that looks to increase by 40mm and is the same fitment as the one you already have
Indeed the specs seem to be incorrect.
Screen Shot 2022-12-06 at 1.35.33 PM.png

Worse still, this review claims it comes with 220mm rotors! Overkill for most folks for street use....

I've reached out to Orbea Support to see if they can verify 1) is it possible to do 180 safely and 2) if so, what adaptor.
 

EMTB Forums

Since 2018

The World's largest electric mountain bike community.

518K
Messages
25,449
Members
Join Our Community

Latest articles


Top