What width fender for 18" Avon Venom rear tire?

[da evil one]

I want the fender to hug my tire real good but I cant tell if 5 1/2 or 5" is the ticket. Ive got to put a new innertube in the wheel so I cant get an accurate measuerment but I figured somebody might know off the top of their head. Thanks in advance!

 

[osteoderm]

The only 18" Venom rear tire on the Avon site is the 150/70B18, which is 5.8" wide. This sheet has all the dimensions.

 

[da evil one]

Thanks osteoderm. Dont know why I didnt think to do that! Well...I ordered a 5.5 for the love of god! Fawk!! But I think 6 would be too wide...I dont know....I know an awesome welder. We can make it into what it needs to be I suppose.