more help wanted on tyre sizes

Submitted: Tuesday, Apr 27, 2004 at 12:54
ThreadID: 12415 Views:2432 Replies:7 FollowUps:3
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Hi everyone

Need some more help. I'm trying to upgrade the original rubber on my 79 series RV trayback. I initially wanted to replace the original rubber with 285/75/16 BFG MT's or Cooper STT's, however ARB southside Brisbane suggested using BFG 305/70/16's which would also mean upgrading the rims from 7" to 8". What size are most people using for outback travel? are the 305's more prone to puntures? or harder to find away from metro areas?

What do you suggest?

Cheers
Jeff
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Reply By: fozzy - Tuesday, Apr 27, 2004 at 13:25

Tuesday, Apr 27, 2004 at 13:25
only difference is width-height is same and most people i know only go as big as 285/75/16 for touring etc and would assume 305's pretty hard to get off the beaten track. give a couple of tyre places a call where you head out for trips to see what they stock. check out a few tyre places and see what they can supply locally.
from what i gather 305/70/16 on 8 inch rims is pushing the limits of tyre size for that size rim
AnswerID: 56189

Reply By: Leroy - Tuesday, Apr 27, 2004 at 13:25

Tuesday, Apr 27, 2004 at 13:25
All my mates including myself have 285/75-16 and I find this is good because if we need to grab a spare off each other we can. I haven't done the calcs but a 305/70 is not going to give you that much more clearance. Plus another consideration may be if you need a lift for these tyres not to scrub. I wouldn't imagine that they would be that easy to get once away from the metro area. Just my $0.02 worth
Leroy
AnswerID: 56190

Reply By: The Banjo - Tuesday, Apr 27, 2004 at 13:42

Tuesday, Apr 27, 2004 at 13:42
Not much to say re your main query on specs and choices but re the supply out of town....keep in mind that when you get right outback, the tyres on offer are very limited - the stock carried by repairers in far away places can be very simplistic - its often budget brands in limited popular sizes, just to get people out of trouble.
When in William Creek SA recently, between the two suppliers they only had Kumho 31x10.5-R16 @ $210, or second hand, really worn stuff - nothing else. Because mixed tyres on certain diffs are not good, second spares of the right sort are the go for a lot of trips. Re that really wide BFG rubber you speak of.... presume they cost bigtime and most bush 'experts' suggest the wider tyres have reduced reliability.....I'm on 245/70-16 BFG's (stock size for the Jack) and will stay with them....been a winner for me.
AnswerID: 56194

Reply By: srowlandson - Tuesday, Apr 27, 2004 at 13:58

Tuesday, Apr 27, 2004 at 13:58
a 305/70/16 is damn close to a 285/75/16 in size.

whilst it is less common in the outback, you will be carrying some form of puncture repair and a pair of spares, so you should be fine... ;)

A fresh new tyre is only a couple of days away via freight... Australia isn't all that remote....

steve
AnswerID: 56197

Reply By: Member - Captain (WA) - Tuesday, Apr 27, 2004 at 15:22

Tuesday, Apr 27, 2004 at 15:22
A 285/75/16 is "equivalent" to a 33" x 11" tyre. The 305/70/16 is "equivalent" to a 33" x 12" tyre. As both rolling diameters are as near equal, all you gain from the 305 is extra width. Do you need or want the extra width?

IMHO 285's are more than wide enough and are a relatively common size (well, more so than a 305).

Cheers

Captain
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AnswerID: 56219

Reply By: Mrs Diamond - Tuesday, Apr 27, 2004 at 18:00

Tuesday, Apr 27, 2004 at 18:00
ive sold 0329578945019750975975 tyres well nearly
i think ive sold maybe 8 305s
AnswerID: 56245

Reply By: mid life - Wednesday, Apr 28, 2004 at 09:02

Wednesday, Apr 28, 2004 at 09:02
Thanks again guy's, now do you think 285's will work OK on 7" alloys that are standard on the RV

Cheers
Jeff
AnswerID: 56342

Follow Up By: Phil G - Wednesday, Apr 28, 2004 at 22:27

Wednesday, Apr 28, 2004 at 22:27
Nope.

285's need 8 inch rims. 255/85R16 are the same diameter as 285/75R16 and are legal on 7 inch rims.
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FollowupID: 318218

Follow Up By: mid life - Thursday, Apr 29, 2004 at 09:22

Thursday, Apr 29, 2004 at 09:22
Phil

It comes with 265/75 on 7" alloy's as standard and ARB said they could fit 285/75's on them, but the BFG brochure spec's 7.5" min for their 285's. just wondering what problems would occur fitting them on 7" rims
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FollowupID: 318274

Follow Up By: Phil G - Thursday, Apr 29, 2004 at 21:40

Thursday, Apr 29, 2004 at 21:40
We're only talking half an inch, so its mainly the legal aspects - I'd hate to be in a prang with a set of undersize wheels on.

Problems with undersize rims are that the tyre is more likely to wear in the middle and may be less stable ie it may squirm around too much. On the upside, they are easier to reinflate as tubeless out in the bush.
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FollowupID: 318388

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