Alternative front tyre sizing

[Fullers1845]

Morning folks, on my CB125F the tyre size on the front is 80/100 - 18; is there any reason why I can't use a 90/90 - 18 tyre? The choice in the 80/100 is really limited, thanks
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Honda CB125F, Kawasaki ZX6R J1, 1922 Sheffield-Henderson Blackburne grasstrack/sprint

[stinkwheel]

There isn't a huge difference. Almost identical rolling diameter, a bit wider. As long as clearance isn't too tight round the sides it ought to work ok.

Maybe try a 2.75 x 18 too?

Metzeler do 80/100 tyres, never tried their roadtecs but they are historically a solid brand for small to medium road bike tyres. They were considered the premium option back when I was a learner rider.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[Fullers1845]