Birty Dastards Jeep Club

Tech Forum => Workshop => Topic started by: Dave69 on December 11, 2010, 03:07:29 PM

Title: equivalent tyre size
Post by: Dave69 on December 11, 2010, 03:07:29 PM

what is the equivalent tyres size of this

2.80/85 x 16 ?


It's an ex-mafia/waggers special so probably unique to the IOM. they're 33" diam but what is the equivalent in metric as the numbers go not what i can fit to the rim

Title: Re: equivalent tyre size
Post by: wrangler07 on December 11, 2010, 06:09:32 PM

Unless I'm confused by your question, if it's 85/16 and 33" it would be 255/85/16 which is what I run on mine.

Title: Re: equivalent tyre size
Post by: Tank on December 11, 2010, 06:37:40 PM

Stock Tire - 255/85R16         >Search Tires   Tire 1 - 33x10.50R15         >Search Tires
Section Width:   10.03 in   255 mm                Section Width:   10.51 in   267 mm
Rim Diameter:   16 in   406.4 mm                     Rim Diameter:   15 in   381 mm
Rim Width Range:   6.5 - 8 in                             Rim Width Range:   7 - 9 in
Overall Diameter:   33.06 in   839.72 mm           Overall Diameter:   33.08 in   840.23 mm
Sidewall Height:   8.53 in   216.66 mm           Sidewall Height:   9.04 in   229.61 mm
Radius:   16.53 in   419.86 mm                    Radius:   16.54 in   420.11 mm
Circumference:   103.8 in   2636.5 mm            Circumference:   103.9 in   2639.0 mm
Revs per Mile:   629.1                                   Revs per Mile:   628.7
Actual Speed:   60 mph   100 km/h               Speedometer1:   59.9 mph   99.9 km/h
Speedometer Difference: -                         Speedometer Difference: 0.063% too slow
Diameter Difference: -                                  Diameter Difference: 0.07%

Title: Re: equivalent tyre size
Post by: Dave69 on December 12, 2010, 08:34:43 AM

these are goodyears and i'm assuming they're a military size possibly ex TGB ?

Title: Re: equivalent tyre size
Post by: Panic mechanic! on December 12, 2010, 11:01:18 AM

they are 280's not 2.8's numpty

http://www.c303.de/c303-en/d-tyres.htm (http://www.c303.de/c303-en/d-tyres.htm)

Title: Re: equivalent tyre size
Post by: Dave69 on December 12, 2010, 01:20:20 PM

just looked and they are 280's so i had a Buldog moment there, shame the sidewalls make them iffy for road use.

Front

(https://birtydastards.com/frm/proxy.php?request=http%3A%2F%2Fi39.photobucket.com%2Falbums%2Fe198%2FDaveP69%2Fjeep%2Ffront1.jpg&hash=dbde44a815bcd74d157cacb0f4d62ffb27a0db54)

some trimming needed
(https://birtydastards.com/frm/proxy.php?request=http%3A%2F%2Fi39.photobucket.com%2Falbums%2Fe198%2FDaveP69%2Fjeep%2Frear2.jpg&hash=02ed9d60aefe0ce14aa6e3fabd18bc416c402a2a)


280's vs 255's
(https://birtydastards.com/frm/proxy.php?request=http%3A%2F%2Fi39.photobucket.com%2Falbums%2Fe198%2FDaveP69%2Fjeep%2Fside1.jpg&hash=e8463612c82d888e0bcbf052f2497ad1cc2eb70d)


rear
(https://birtydastards.com/frm/proxy.php?request=http%3A%2F%2Fi39.photobucket.com%2Falbums%2Fe198%2FDaveP69%2Fjeep%2Frear1.jpg&hash=f810098176923e55caa20e4cbe8b328b2f44e2aa)

trimming to the front as well
(https://birtydastards.com/frm/proxy.php?request=http%3A%2F%2Fi39.photobucket.com%2Falbums%2Fe198%2FDaveP69%2Fjeep%2Ffront2.jpg&hash=1b7792ba2a9387f0eb183db1376a5d9abbe17c28)

some spacers for the rear will be needed
(https://birtydastards.com/frm/proxy.php?request=http%3A%2F%2Fi39.photobucket.com%2Falbums%2Fe198%2FDaveP69%2Fjeep%2Frear3.jpg&hash=d17dff5d6efd41c6531ec623cdb800b16d0eab3f)

Title: Re: equivalent tyre size
Post by: JamesH on December 12, 2010, 05:06:35 PM

They are gonna fook your Jeep right up - post the carnage pics!  :003:  :098:

Title: Re: equivalent tyre size
Post by: Dave69 on December 12, 2010, 05:43:31 PM

those wont be run just fitted to check what would clear and needed to be done

Title: Re: equivalent tyre size
Post by: Panic mechanic! on December 12, 2010, 05:45:20 PM

havin driven them on the road, you will be glad you can't do it.....sounds just like a series lardie only louder lol but they don't look bad otherwise...... excuse for a bigger lift then dave.....

Title: Re: equivalent tyre size
Post by: JamesH on December 12, 2010, 07:14:39 PM

I'm only messing with you Dave - you will be amazed at how many little things and the extent of trimming need when going from 31 ish tyres to 33 ish. spacing away from springs, getting a turning circle back, opening the wheel wells front to back and covering tyres width ways, bumpstopping, the weight effect of the tyres (especially those I'd guess) as well as the increased diameter....

otherwise, looking good  :greggmo:

Title: Re: equivalent tyre size
Post by: Dave69 on December 12, 2010, 08:23:33 PM

even though the sizes is great the 280 width is a bit much at the moment. tyres will be off and offloaded onto the bay at some point and replaced by 255's.

No more lift just drop, need to work out the bump stops etc for it to work well. TBH not realy interested in trying them out on the road even for a short trip

Title: Re: equivalent tyre size
Post by: isle of man on December 12, 2010, 08:39:49 PM

I drove on those tyres from kil Sweden -  noisy at 60MPH to say the least - very strong tyre and surprising ability off road.

Title: Re: equivalent tyre size
Post by: JamesH on December 12, 2010, 09:19:06 PM

I have 285s on my XJ so if you need any help or want any pointers on how to fit that width tyre just let me know or send a PM.

Title: Re: equivalent tyre size
Post by: Dave69 on December 13, 2010, 12:57:59 PM

to be honest Pete they do look a good tyre for off road, it's just a shame about the rubber showing it's lack of use.

i read one comment that made me smile. someone was asking the load rating of the tyre, the answer was the vehicle will more likely be crushed before you exceed the load rating.

being a 280 section tyre they do sit well on the 7 inch rim tho'