well i have a pair of 451's lying in storage and need to get another two tyres hence the question and i have a 2wd set of comps, and was wondering if the front set of 7.5j can be used with the 8j's on my 4x4, and basically 215/40/17 452's are a lot cheaper than 245/35/17's. just me being stingy. the different tread patterns between the 451's and 452's should be a problem should they?