I just bought a 2011 SL02 Roadracer and was wondering if I was able to replace the 23 tires to 25's?
Would rim size be what is posted on my rims, which is 622x14FWIW: Actual inflated tire width depends on the bead width of the rims too. In my experience, 23mm wide rims increase tire width by ~2mm compared to traditional 19mm wide rims. For example, I have Mich Pro3 (now 4) mounted on a number of rims and they measure 23 wide on the traditional rims and 25 on my 23mm wide HED rims.
I had cruds on my SLR01. I can't imagine a frame they couldn't be made to fit. They were a pain to install, remove and adjust, keep from scraping, extremely fragile, etc.. I since got SKS Raceblade LONGs. (the LONG is important) These work great and provide nearly full coverage. (actually I used the front part of the crud rear fender with the RBLs because is shields the FD and chain better. The RBLs do weigh a bit more and are wider so less aero if those are considerations for your rain riding. Once the mounting tabs are in place under the brake fixing bolts, they can be clipped on and off in seconds and require no adjustment.A question not about tyres, but related to the frame space: do you know if it is possible to install the complete Road Racer Mudguards MK2 from Crud?