Minor tire stretch question

so i got new wheels and i was trying to mount my tires.. first i went to sears and they mounted my 215 35 19 on my 19x8.5 with no problem..then they tried to mount 235 35 19 on my 19x9.5 and couldnt make it work.. so i took them somewhere else.. they got one mounted but said that he would put 60psi and then 10 mins later it would be down to 40.. should i take it somewhere else? are they doing something wrong.. he didnt use a cheeta or anything.  Should i get a thicker side wall perhaps 235 40 19? thanks

i had a 225/35 on my 10'' went on with no problem. maybe thats the tire guy who doesnt know what hes doing.

so should i take it somewhere else?

yeah. hit up a place that's used to dealing with custom/larger wheels. and not sears. those dudes don't care about screwing up your rims, at all. 

I feel your pain man, I have to ship wheels and tires out for repairs and mounting because there's NOone reputable around here.

yea hopefully i can find some1 that can do it

is the tire youre trying to mount used?  if not take it to discount tires they'll do it for you they put on stretched tires on for me all the time.

they could have ripped the beads on the tire when they tried to mount it. it shouldnt leak at all.

Did they replace the valve stems maybe used old valve cores?

location? maybe someone can help with a recommendation.

yeah never should have gone to sear,I had 225-30 on a 9.5 with no problems..find a place that does alot of aftermarket wheels..