series 75 LC Ute Split Rims

Submitted: Friday, Jan 24, 2020 at 17:22
ThreadID: 139587 Views:954 Replies:4 FollowUps:8
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Gday,
I have a 75 Series LC with 16" split rims running LT 7. 50 R 16 122/121L (not sure what the 122/121L numbers mean?) Need to replace tyres but have no idea what other tyres will fit on those rims (want to keep the rims). Would appreciate if anyone can give some guidance or alternative tyre sizes to another set of LT's ? ie how wide can i go and what profile can i go ?
cheers
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Reply By: Peter_n_Margaret - Friday, Jan 24, 2020 at 18:04

Friday, Jan 24, 2020 at 18:04
The 122 is the load rating for the tyres on your vehicle.
121 is the rating for the same tyre used as a dual instead of as a single.
L is the speed rating.
https://help.tyresales.com.au/hc/en-gb/articles/360015939612-Tyre-speed-rating-and-load-index?gclid=Cj0KCQiApaXxBRDNARIsAGFdaB8DB557blGR0d3yJHnouEA9faYGbZlXCB5VzzKxtZxtAef5hkjMtnAaAjvrEALw_wcB
From memory, a 225/85R16 is the metric equivalent to the 7.50R16, but there are plenty of 7.50R16s still about.
Cheers,
Peter
OKA196 motorhome
AnswerID: 629683

Follow Up By: marcus w1 - Friday, Jan 24, 2020 at 19:04

Friday, Jan 24, 2020 at 19:04
Thanks Pete
So a LT 265/75 R16 123/120r would be suitable then ?
Cheers
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Follow Up By: Bob Y. - Qld - Friday, Jan 24, 2020 at 19:54

Friday, Jan 24, 2020 at 19:54
I've used 235.85R16 on split rims successfully, and they have a slightly higher load rating than 7.50x16.

Don't think 265.75R16 will fit your split rims, that tyre size needs 7"-8" rims. Split rims still have a following, but they are heavier to carry as spares, increase unsprung weight and utilise tubes that are increasingly expensive and not always of desirable quality. Their only favourable quality is the speed with which they can be dismantled, even with a couple of screwdrivers...........

Bob

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Follow Up By: RMD - Friday, Jan 24, 2020 at 19:59

Friday, Jan 24, 2020 at 19:59
Marcus
Are you asking Peter or telling him. Please look at the tyre you have just started and it's width. A 7:50 16 is 7.5" wide. Peter suggested a 225 wide which is 1 1/2 wider and probably the limit of the rim. Now you bring into play a 265 wide tyre and want acceptance for that! 265 is MORE than 2 1/2 " wider than OE. I had 265 tyres on 16 " rims but they were wider rims than my stock splits were. Best to check out tyre sizes and the correct fitting of same for your safety and legality.
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FollowupID: 904731

Follow Up By: marcus w1 - Friday, Jan 24, 2020 at 21:03

Friday, Jan 24, 2020 at 21:03
Thanks Bob
I want to keep the original rims so trying to find a cheaper alternative than 4 x new LT tyres. Will look for some used 235’s or less.
Cheers
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FollowupID: 904734

Reply By: Bushranger1 - Friday, Jan 24, 2020 at 21:19

Friday, Jan 24, 2020 at 21:19
G'day Marcus,
Had split rims for years & loved them for bush tyre repairs.
Just be sure to use high quality tubes if you replace them. There are lots of lousy quality ones that just split & cause immediate tyre deflation & tyre damage. Also make sure the fitter removes any internal stickers from the inside of the tyre carcass before fitting or these can damage the tubes too.
Cheers Stu
AnswerID: 629690

Reply By: Mikee5 - Saturday, Jan 25, 2020 at 09:28

Saturday, Jan 25, 2020 at 09:28
I have used LT235/85R16 for many years, but do make sure you get good quality tubes. I prefer the higher aspect 85% for softer sidewalls and a tiny bit of extra height
AnswerID: 629695

Reply By: Athol W1 - Saturday, Jan 25, 2020 at 10:32

Saturday, Jan 25, 2020 at 10:32
Marcus

In addition to looking at the tyre SIZE you must also consider if the tyres that you are looking at are suitable for the SPLIT RIMS.

The bead and seat section of the tyre for split rims is different to those designed for single piece rims, and are NOT interchangeable.

The split rim tyre seat area is usually at a 15 degrees angle, whereas the tyres for the single piece rims are usually at, or close to, zero degrees. Single piece rims also have a secondary, or safety, rim that is designed to hold the tyre bead in place in the event of a tyre failure.

Regards
Athol
AnswerID: 629699

Follow Up By: Mikee5 - Saturday, Jan 25, 2020 at 12:22

Saturday, Jan 25, 2020 at 12:22
Hi Athol, because I have never heard of this before and have used split rims now for over 45 years, can you tell me how the difference is recorded on the tyre apart from the LT235-85R16 116/120, which is all I can see. Can you also point me out to some documentation about this difference, eg a web page or reference. Apparently I have been buying, and have been sold, and have had fitted by tyre dealers, the wrong tyres since 1978. I am very interested as I currently have 4 plus 2 spares on the vehicle, plus 2 plus spare on the caravan . 9 wrong tyres fitted by Bridgestone
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FollowupID: 904743

Follow Up By: Athol W1 - Saturday, Jan 25, 2020 at 12:33

Saturday, Jan 25, 2020 at 12:33
Mikee5

I am not aware of any particular markings, except that any tyre marked as Tubeless is definitely not designed for split rim fitment due to them lacking the 15 degree seat angle.

Regards
Athol
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FollowupID: 904744

Follow Up By: RMD - Saturday, Jan 25, 2020 at 12:45

Saturday, Jan 25, 2020 at 12:45
Yes tyre repairs with a split rim may be easier to repair in some circumstances but stick a pin in a balloon and see what happens. If the side wall is ripped out then all air will be gone from either tyre but the tube type doesn't self heal to ANY degree and so air is lost immediately. With a tubeless tyre on suitable rim size the air doesn't immediately deplete which makes steering and braking possible for a while. Tubeless, instantaneous, or almost, loss of air and then the fun starts. All not such an issue in the bush where speeds are slow but on highway I know which type of tyre/rim combination I prefer. I have owned quite a few motorcycles, tube type and tubeless, again I like the tubeless as they are safer and don't unload you suddenly. There are two ways of "hitting the road". All is ok while all is OK but when it isn't??
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Follow Up By: Ron N - Monday, Jan 27, 2020 at 12:01

Monday, Jan 27, 2020 at 12:01
Tyres are marked as tubeless or tube-type, and they are not interchangeable, as Athol correctly points out.
The marking is on the tyre, it pays to read up all about tyre markings, and what they mean.

HINT: (gained from long experience). Get hold of some talc or French chalk, and shake plenty into the tyres before you install the tubes.

Talc is an excellent lubricant between tube and tyre, and it not only reduces friction and heat buildup, it will help protect the tube from being chopped up if you get a sudden flat at highway speed.

Talc will keep the tube re-useable after a high-speed stop with a flat - whereas, with no talc in the tyre, the tube will be chopped into rubber salad, by the time you come to a halt.

Cheers, Ron.
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FollowupID: 904813

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