Not in the back, but I fitted a crossmark 2.0 in the front for summer cross. If it's very muddy I found a narrow 33mm cuts through the mud better anyway. Not sure what 650 mtb mud tyres are available - tend to be narrower than 2.0
So far I only found Crossmark in 1.95 or 2.10 sizes, which one did you actually have if you remember?
I'm away at my boat but I'll check tomorrow when I'm home
@Prz started
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Not in the back, but I fitted a crossmark 2.0 in the front for summer cross. If it's very muddy I found a narrow 33mm cuts through the mud better anyway. Not sure what 650 mtb mud tyres are available - tend to be narrower than 2.0