Anyone know the widest tires I can put on 9sp Ultegra Brakes...

I have an old specialized 2001 Allez triple w/9sp Ultegra that doesn't get much use anymore, would like to ditch the 23mm's for something more comfortable and quiet. Use the bike for short trips. Not sure the widest tire I would be able to put on....

Usually the frame and fork limits the tire size. If your frame and fork allows it, you should have no problem fitting a 28 in your brakes. (a 28mm tire is usually the limit for narrow rims)

I've got a set of 28s on mine, and it fits within the Ultegra brakes fine. Room to spare.

I do open up the brakes to get the tires in and out, but that's no biggie.