Did you change rotor sizes also?

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Hi, I changed the.rotors but kept to 180mm

 

If it had Shimano calipers before and you didn't change the rotor size...you shouldn't need a new adapter....hmm

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Can you post a pic, it might help?

 

Yep, this is the adaptor , I'll send one of it on the bike with the caliper

 

On the bike

 

On the bike
View attachment 1933828

The globe-like shims go between the caliper and the adapter, not below the bolt head.

EDIT: Or maybe not? from the pictures on the web it seems they should not. Weird.

 

This is the mark where the rotor is hitting the caliper

 

Wondering if I need this instead ? 🤷

 

Hard to see on your last pic. When you set up the rotor/pad gap evenly on both sides is the actual caliper central over the rotor, i.e. is the rotor in the middle of the grooves inline with the seam between the two halves and not slightly off to one side?

EDIT: That adaptors is no good to you as it's an I.S. mount not a post mount adaptor.

 

, yep the rotor is central in the caliper , its driving crazy

 

Is the rotor rubbing at the top and bottom of the caliper?

 

Good point , just checked and yes it is

 

does it rub with the old rotor?

 

I haven't tried swooping it back , just put the old rotor next (on top of) the new one they are practically identical

 

You have the right adaptor and the rotor should fit fine and within the caliper. Rule out another adaptor as the next one up is a +23 for fitting a 203 rotor to 180 post mounts which would put the caliper too high.

 

I would of thought I had the right adaptor as well, the one I sent a pic from Amazon by description seems to do the job , but I just don't know , and getting very fed up 😓 they both are for 180mm

 

Forget that Amazon adaptor it literally won't work as it won't mount to your post mounts forks.

 

I'm wondering if the rotor was incorrectly labelled, or packaged, and is really a 183 or 185.

 

Anything is possible as this isn't normal. I have the very same RT66 rotor fitted on the rear of my bike with 160 post mounts and the same adaptor. I have the same 203 rotor on the front with the 180-203 adaptor and both fit perfectly. As far as I know those Shimano rotor only come in 160,180 and 203 sizes? Maybe the top of the post mounts on the forks have had too much material removed when being faced?

Could be worth a simple test mount on the rear if possible to double check if the problem is still happening there also?

 

Agreed. It's a bit of a poser. I'd be much happier if I could put my hands on problems such as these.

Swapping to the back is a great idea if it's 180mm front and rear.

 

Lol.🤣 Yes very frustrating and hands on would be so much better in these situations.😡

 

Is the adapter upside down?

 

Yeah I wondered that , it does have an arrow saying which way is up, but have just tried it both ways and still not working , I put on old caliper and that's rubbing now also , can't swop rotor over to old one as I haven't got any of the clips that goes on the screws but it looks same size ,old rotor I'm front of new one no

 

I put on old caliper and that's rubbing now also

So if the old caliper rubs on the new rotor, it must be the rotor. Is the rotor centered well? Like does it only rub in one spot as the wheel turns, or it rubs continuously all the way around?

 

I guess you could fit some shims that are roughly the thickness you need the caliper to move outwards by to stop them rubbing.

You could put the old rotor back on as you can usually reuse those clips or even fit rotor without them, not a problem if you torque up correctly (4Nm with torque wrench or the approx pressure of a stiff door handle) and add some threadlocker to the bolts.