The inner width of the SLR is 18mm. I run a Mavic 819MX rim with an inner width of 19mm and the max tire size is 2.3. I think 2.25 tire is pushing it on the SLR. 2.1 sounds more like it.
There's no problem using a wide tyre like a 2.25, however there will be considerably more tyre roll in the corners than with a wider rim. 2.0/2.1 is what the SLR is designed around
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