When did rim braked road frames get increased tyre clearance?

fat bloke

I have a pair of Hunt aero wide carbon wheels, 27.2mm wide at the rim. They don't fit any of my current bikes however. I like the wheels though so, rather than sell them I've been keeping an eye out for a frameset / bike that will accommodate them. It's hard to pin down however what frames are compatible with them and I wondered when rim braked frames became a bit more generous in tyre clearances. I have a feeling it's only the very newest rim braked frames, like 2020 onwards which makes for a very small window because it's really then the market moved wholesale over to disc braked frames really.

It's a funny one from Hunt, or any other wheel manufacturer, because a 27 mm rim is surely going to need a 27 or 28mm tyre and I can't see ultegra R8000 or DA 9100 calipers taking a 28mm tyre easily.

Maybe I would be better off seeing the wheels altogether rather than seeking a round hole for my square peg?

harmless

I've used 28mm wide wheels on my 2016 Canyon CF SLX. Works just fine with the ultegra 6800 brake calipers, 28mm is the max width that Shimano say it can accomadate. I used a 25c tyre on it which comes to 28mm because of the 21mm internal width of the wheel.

Squidgy Black

R8000 and r9100 should take 28mm pretty easily, I know r7000 brakes do as I run 28mm on mine

CantGetNoSleep

https://www.boards.ie/discussion/comment/119440761#Comment_119440761

I would have said around the time of Ultegra 8000 too. I had a Canyon Ultimate from 2015 or 16 and I could get a 28mm on but with difficulty and even deflating to pass under the brake pads. I've a CAAD12 and wouldn't attempt a 28mm. Both on Ultegra 6800. The trend towards wider tires is 4 or 5 years old at least though

magicbastarder

i run 25s on ultegra 6800, and IIRC I can get the wheels off without using the cam mechanism to open the calipers - the tyre will rub on the brake blocks as it comes out, but won't get stuck.

fat bloke

Thanks all. Apart from the calipers the issue with all my oldish frames is wheel rub inside the forks and chainstays. My newest frame is a 2018 Cervelo S2 but the clearance is too tight for the Hunts. That would have come new with older (not 7000) 105.

Is there a rule if thumb for minimum clearances either side on rear chainstays to stop wheel rub from flexing under load?

Mr. Cats

I have a DA-9000 set up with 28s and no issues with clearance on callipers there either. Frame is 2018 but pitched as an ‘all road’ at the time so clearance probably a bit wider than norm.