Birty Dastards Jeep Club

Tech Forum => Workshop => Topic started by: stevehutch on August 06, 2012, 10:47:59 AM

Title: Wheel Size Conumdrum (Help Please)
Post by: stevehutch on August 06, 2012, 10:47:59 AM: Hello Everyone,
I am new to Jeeps having just acquired a 1997 R plated 4.0 Petrol XJ Grand Cherokee Laredo.
Initial driving seems great, excellent turn of speed and no dramas pulling our 21 foot caravan. I an well pleased.
However I have come from a Hilux Surf and my cherokee looks tiny next to the surf.
I am wanting to do a 3 to 4 inch lift which will bring her up to height but I would like to use my nearly new 31/10.50/15 AT tyres from the surf, so to all you knowledgeable people on the forum can you advise. I currently have 16 inch wheels on the cherokee which I want to dump in favour of 15 inch wheels.
I really want just basic 15 inch steel ones but what offset or PCD etc will suit the tyre size and the vehicle? Apologies but after looking through the forum I am still none the wiser or just a thicko!!!!
Ta
Title: Re: Wheel Size Conumdrum (Help Please)
Post by: Nosebolt on August 06, 2012, 11:33:39 AM: Before anyone can answer we need to know if you have a XJ or a Grand Cherokee (ZJ)
Title: Re: Wheel Size Conumdrum (Help Please)
Post by: wildwood on August 06, 2012, 11:47:21 AM: 5 on 4.5" pcd

Or in catholic/napoleon 5 on 114.3mm

be careful about backspace offset cos you'll need to clearance the valance in front of the front wheels.

will also affect your gearing.......not normally a prob unless you tow to max weight in which case OD is redundant....

Some one will come along with a complete recipe for you in a mo.

welcome.
Title: Re: Wheel Size Conumdrum (Help Please)
Post by: stevehutch on August 06, 2012, 12:00:39 PM: Sorry, that was my ignorance of variants Its a Grand Cherokee Laredo 1997 so I presume its a ZJ,
Thanks for the help
Title: Re: Wheel Size Conumdrum (Help Please)
Post by: Dave69 on August 06, 2012, 07:25:47 PM: leave the 16's on and buy the metric equivalent of 31's
Title: Re: Wheel Size Conumdrum (Help Please)
Post by: Mike Pavelin on August 06, 2012, 08:36:31 PM: Laredos usually have 15" wheels. I wouldn't use 31" tyres if you're towing, it'll raise the gearing too much.
Title: Re: Wheel Size Conumdrum (Help Please)
Post by: stevehutch on August 07, 2012, 09:57:51 AM: Hi,
Good answers from all. As we will be towing a lot I guess the 31's will have to go. I was just trying to utilise them as they are so new,
I guess someone in the past must have changed the stock 15 inch wheels for the 16 inch alloys which are on there now. I guess some a/t tyres for the current wheels and a budget boost lift will do for now.
Thanks everyone for helping
Steve
Title: Re: Wheel Size Conumdrum (Help Please)
Post by: stevehutch on August 07, 2012, 10:40:25 AM: Hello Again,

One more piece of advice please.
If I go with the 2 inch budget boost and I am currently running 225/70/16 tyres then what size can I safely go up to on the rims I have bearing in mind that I will be towing a lot as well.
Can I go to 225/75/16 or can I go to 235/75/16 etc

Thanks Again
Steve
Title: Re: Wheel Size Conumdrum (Help Please)
Post by: Jeepjedi on August 08, 2012, 10:42:25 PM: good guide here from JP magazine

[attachment=1]

then go here for tyre size calculations, stick ya tyre size in at the bottom and hey presto

http://www.birtydastards.com/frm/index.php?action=ezportal;sa=page;p=8 (http://www.birtydastards.com/frm/index.php?action=ezportal;sa=page;p=8)
Title: Re: Wheel Size Conundrum (Help Please)
Post by: stevehutch on August 09, 2012, 09:17:49 AM: Thanks JeepJedi, that chart is the dog's dangly's

Steve