Forum home Road cycling forum Workshop

TRP spyre adapters

I wish to upgrade the size of the rotors on my boardman adv 8.8 . They're trp stores with 160mm rotors.

I can tell they're post to post on both but do I need specific trp ones?
Say... That's a nice bike..
Trax T700 with Lew Racing Pro VT-1 ;-)


  • whyamiherewhyamihere Posts: 7,679
    They're not post mount, they're flat mount, and unfortunately 160mm is the biggest you can go. There are a few gravel bikes made to accept a 180mm rotor with flat mount calipers, but they have the mounting holes in a different location on the fork.
  • pilot_petepilot_pete Posts: 2,120
    edited October 2021
    Why do you want to change the size of your rotors? Is your braking not adequate with the 160mm rotors? If not, are you sure the rotor swap will make much difference? It’s more likely your current setup needs adjustment/ pad maintenance to get them working optimally in my opinion. Spyres are pretty good as cable operated discs go as long as they are maintained well in my experience, but you do have to do it regularly to keep optimal performance.

    My wife’s bike has them and they are good when working right. I wouldn’t bother with changing to different sized rotors as an ‘upgrade’ - if she wanted them upgrading I would fit hydraulic. That truly is an upgrade. I changed my winter bike from BB5s which were frankly not great to Shimano 105 hydraulic. The difference was night and day with the same rotors.

    On a summer bike with Shimano RS785 hydraulic brakes and 140mm rotors I did find I overheated and warped a front rotor. Overheating a rotor would be a reason to switch to a bigger rotor to gain a bigger surface area and to dissipate heat better. However, I fitted Dura Ace Freeza 140mm rotors which have heat dissipation fins and can thus handle greater heat build up as my first port of call. If they still couldn’t handle the heat then the next move would have been to go 160mm on the front. I have not needed to do this.

    I have two summer bikes fitted with 140mm Freeza rotors and the stopping is as good as I’ve ever had on a disc braked bike. I’m not lightweight at 83kg but don’t experience any problems on U.K. descents. I probably would fit a 160mm Freeza front rotor if I was going to take one of those bikes to the Alps or Pyrenees.

    So unless you are overheating your 160mm rotors I’m not sure fitting bigger ones would be an ‘upgrade’ as you call it. Plus of course, as someone else has said, you probably won’t be able to get a mount to accommodate them. Why is that? Because you really don’t need rotors bigger than 160mm on a road bike.
Sign In or Register to comment.