Tire sizes, Do you have to use the same as original?

[NokNok]

Hello first time posting here. I have just brought a KVF 300 and the tyres need replacing. i was wondering about the sizes do you have to use the same as what are on it or can you change them a bit. the sixes are 25 x 8 - 12 front  and 25 x 11 - 10

i am having trouble finding the 25 x 11 - 10  could i go to 25 x 10 or 25 x 12 having trouble to get the 11 for a good price

or can i even get bigger back rims

what are the options there

 

Thanks Quadcrazy

[wanrep]

Find some used rear rims from a 650/700/750 Brute Force or Prairie.  They use a 25x10-12 tire.

You'll have an endless choice of tires and they'll be a lot cheaper than 25x11-10.

[orangeRcode]

The 98 Bayou 300 2x4 I picked up has dry rotted tires and need to be replaced.  They appear to be an oddball sized as there aren't many new ones available.  Front 22x9-10  Rear 24x11-10