A 6+1 offset keep you very close to stock width, maybe 1/2" wider in the front depending on the actual wheel and tire. It will actually make the machine a little narrower in the rear (1-2") as well. ( you're going from a 9" wide tire to a 10" in the front, and an 11" tire to a 10" in the rear, so the tire makes a difference in overall width as well, keep that in mind )

 

If you wanted a 15, Method makes the 401-R in a 15x5 with a 5+0 offset, so that would keep you at factory width I believe. the narrower wheel would give you more ballooning for more protection for the wheel. however depending on your style; that might have a slight loss in handling, IDK

 

Personally, I wouldn't mount a 10" tire on a 5" wheel, 6" is the smallest I'd go, and a 5+0 would actually make the machine 2-3" ( possibly more ) narrower in the rear. Not very many aspects of a 5+0 wheel setup would be optimal in my book.

 

as many have done, including myself. find a set of OEM front wheels and add them to the rear.
there are plenty of people off-loading their OEM's for cheap. including almost new (or new) bighorns attached.

 

The front wheels I believe are 14x6. Could I put a 10" tire (30x10-14) on that rim safely?

 

i just installed a new set of 30x10x14 Tusk Aramid's on stock front wheels (with the help of @RWB713 advice).. no issues
rep inbound RWB

 

Look at these wheels:

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UTV Parts, PRP seats, PRP doors, UTV beadlock wheels, UTV belt temperature gauge, seat belts and harnesses, UTV park brakes

www.proutvparts.com

Maintain your UTV’s factory width using the all-new STI HD9 6+1 Comp Lock beadlock wheel. In 14×7 and 15×7 sizes, these new 6+1 (50mm positive offset) fitments help vehicles maintain OEM width in most applications, including new 72-inch wide and 50-inch trail legal models. This positive wheel offset also reduces scrub radius to optimize handling.