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Dino Don
06-06-2011, 10:59 PM
Anyone know of any issues with increasing tire and wheel size on original 1987 Prostar single axle trailer. It has 14 inch wheels, Chrome Keystone Classic Cragars, I want to lift boat up off road a little bit. I have nicked the prop before and since it doesn't have a prop guard I thought 15" wheels and tires would be a big help. Don't know if the stock fenders on the trailer will need to be opened up any either???

Maybe soneone has been down this road before??? Thanks for any help/direction.

nitro5238
06-06-2011, 11:13 PM
I have been wondering the same thing myself......seems like you would actually only raise the prop 1/2 inch because the other 1/2 inch would be on the top side of the axle. Would this be a correct assumption? What the heck....I think the 15 inchers would look much better even if you couldn't go four wheelin' with em.

oldairboater
06-06-2011, 11:22 PM
They need to fit under the fenders but otherwise it is not that much of a problem. We have changed rim sizes several times over clearance issues.

j.mccreight@hotmail.com
06-07-2011, 12:03 AM
I had to lower my tongue a little for more clearance as I would scrape my prop guard on road humps but going with a taller tire is easy to do, just need to figure total movement of suspension, current tire height and the total clearance of new tires leaving about 2 inches for extra measure, discounttire.com has a nice tire calculator on their website to figures tires sizes...

madman
06-07-2011, 12:01 PM
I have a 93' ps190 with a single axle trailer, a couple of weeks ago I got a blowout at 60mph. I changed the stock 14" chrome wheels to 15" aluminum and put 225/70/15 load range E tires on them. Now the trailer sits up about 1 inch higher and I don't drag the rear of the trailer in the dirt near as much, it also tows better and does not sway and bounce like it did with the smaller light duty tires. I had to trim a very small amount of the outer portion of the fenders to prevent rubing as the tires were close but now they work fantastic. I recomend this mod to anyone with a single axle trailer.

supturb89
06-07-2011, 12:17 PM
There is some good info in this thread.

http://www.mastercraft.com/teamtalk/showthread.php?t=30323

1redTA
06-07-2011, 12:21 PM
what about longer shackles or some new leaf springs? or even a block between the axle and springs

Dino Don
06-07-2011, 01:16 PM
what about longer shackles or some new leaf springs? or even a block between the axle and springs

Might have to block it up for much bigger tires--mine are pretty close to the fenders with the 14"s on it now. Of course blocking it might lift it enough.??????

Also, haven't checked them for size of bolt pattern--are they 4 1/2 ?

j.mccreight@hotmail.com
06-07-2011, 01:46 PM
Yes wheels are 4.5...

Dino Don
06-07-2011, 05:30 PM
Thanks for all the info! Think I'll get some 15's on it.

thatsmrmastercraft
06-07-2011, 05:43 PM
You don't necessarily have to switch to 15" wheels - you could potentially go to taller 14" tires.

Dino Don
06-07-2011, 07:16 PM
You don't necessarily have to switch to 15" wheels - you could potentially go to taller 14" tires.

I'm running 70 series Uniroyal rwl radials--guess I could I thought the radials would be better.