Hi there, you can fit a 110 on the front and a 130 in the rear but in all honesty I would keep the 100/90 on the front.
Choice is a bit limited cos of the 16" front but BT45's are an excellent all round tyre and suit the pop-up well.
Demons or super demons(?) are available and I'm pretty sure Continental do a stickier tyre now.
pop up tyre's
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Pop-Kat
Re: pop up tyre's
I agree with Chris, best tyre for what you want is the Bridgestone BT45, 130/80/17 goes on the back nicely. they do two 110 sizes a 70 profile and a 90 profile, ideally you'd want a 80 profile though..Or you could just stick with the std size front.
