how much will tyre width (i.e. knob width) be affected by moving to a wider rim?
i have precious little space to play with, but would like to move up to a sun ringle mtx33 from a mavic tn719…

Guestimate it’ll be about a factor of 3 (i.e. pi) as your changeing the circumfrance of the tyres cross section.

TN 719 = 19mm
MTX33 = 26mm

So 7mm different, so the tyre will be about 2mm bigger?

the pi thing makes sense, ta much for the reply.

Id keep the Mavic rim over some tat Sunn rim anyday.

It will give you a flatter tyre profile also