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Issues with disc brake adapter upside down

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Old 04-12-23 | 09:31 AM
  #26  
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Originally Posted by cobba
The inner edge of the rotor isn't a good way to check for alignment.

Shimano makes two types of rotors (narrow and wide) and two types of pads (narrow and wide), they don't recommend using wide type pads on narrow 2 piece rotors, the pads used in the Spyre/Spyke brakes are exactly the same as Shimano wide type pads, the rotor you're using looks to be a Shimano narrow 2 piece like the RT76 / RT81 / RT86 / RT-EM800.

I've seen a few photos of wide pad use on narrow rotors, the pads were overhanging the inner edge of the rotor and wearing on the arms of the rotor.

What you can see from the outside looking in, mightn't show the full story, after a bit of use I'd remove the pads from the caliper to see if there's any unusual wear on them.




Whoa. I did not know there were 2 rotor widths. Yes, the pads do hang down past the rotor and encounter the rotor arm, the rotors are XT level, unsure of model number. Well frig, I have to get new rotors now. <sigh> Does the pain ever stop?

Thank you for your help.
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Old 04-12-23 | 09:32 AM
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Originally Posted by ahsposo
It wasn't cheating, you know that, cheating implies you didn't encourage him. You practically pushed him out.
Lies.
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Old 04-12-23 | 12:19 PM
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Originally Posted by digger
Whoa. I did not know there were 2 rotor widths. Yes, the pads do hang down past the rotor and encounter the rotor arm, the rotors are XT level, unsure of model number. Well frig, I have to get new rotors now. <sigh> Does the pain ever stop?

Thank you for your help.
...on the brighter side, this allows you to buy the Titanium brake rotors that you really wanted all along.

Originally Posted by digger
Lies.
...are you and your wife still resistant to my suggestion we go to throuples therapy ?
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Old 04-12-23 | 12:55 PM
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I think (people correct me if I'm wrong) a rear 160mm adapter has the same geometry as a front 180mm adapter (I know Shimano has separate models for 180mm front and 160mm rear), so (I think) you could get a 180mm rotor and turn your current adapter right side up and it would work.

Originally Posted by digger
Whoa. I did not know there were 2 rotor widths. Yes, the pads do hang down past the rotor and encounter the rotor arm, the rotors are XT level, unsure of model number. Well frig, I have to get new rotors now. <sigh> Does the pain ever stop?

Thank you for your help.
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Old 04-12-23 | 04:17 PM
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Originally Posted by cobba

Shimano makes two types of rotors (narrow and wide) and two types of pads (narrow and wide), they don't recommend using wide type pads on narrow 2 piece rotors, the pads used in the Spyre/Spyke brakes are exactly the same as Shimano wide type pads, the rotor you're using looks to be a Shimano narrow 2 piece like the RT76 / RT81 / RT86 / RT-EM800.
The rotor is an SM-RT98-S.
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Old 04-12-23 | 04:37 PM
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Originally Posted by 3alarmer
...on the brighter side, this allows you to buy the Titanium brake rotors that you really wanted all along.
Beautiful! Any in carbon?
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Old 04-12-23 | 08:09 PM
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Originally Posted by digger
Beautiful! Any in carbon?
...if you build it, they will come: Alpha’s Ceramic Rotor RS – superlight Spanish carbon disc brake rotors
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Old 04-12-23 | 08:25 PM
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Originally Posted by tyrion
I think (people correct me if I'm wrong) a rear 160mm adapter has the same geometry as a front 180mm adapter (I know Shimano has separate models for 180mm front and 160mm rear), so (I think) you could get a 180mm rotor and turn your current adapter right side up and it would work.
It would probably work, SRAM doesn't have front and rear specific adapters, they have a 20mm IS adapter that's for front 180mm and rear 160mm


Originally Posted by digger
Yes, the pads do hang down past the rotor and encounter the rotor arm, the rotors are XT level, unsure of model number.
Does the following image shows how the pads are contacting the rotor?

If it does, it would be an indication that something isn't right with your setup



Last edited by cobba; 04-12-23 at 08:40 PM.
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Old 04-14-23 | 06:12 PM
  #34  
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Originally Posted by cobba
It would probably work, SRAM doesn't have front and rear specific adapters, they have a 20mm IS adapter that's for front 180mm and rear 160mm




Does the following image shows how the pads are contacting the rotor?

If it does, it would be an indication that something isn't right with your setup


I went to my LBS and got the proper front adapter. It now sits better, but the pads do hang down past the rotor , similar to that image.
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