S2A tyre sizes

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Originally Posted by Indiana Jones

I'm rebuilding one for a mate and he is keen on putting Disco 1 steel rims on it - would it affect the turning circle?

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Mate, Disco 1 steelies will fit with out the slightest fuss. I have them on my SII and did Cape York on them without a hitch.

However, these rims are 7inch wide and are too wide for 7.50 let alone anything smaller. Best tyre to use on D1 steel rim fitted to a Series is 235/85R16. Very similar diameter to 7.50s but a tad wider. Turning circle, at least in my experience, wasn't effected too badly as most of the extra width goes out - tyre/rim combination fills the wings quite nicely.

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Originally Posted by Turtle61

<snip> ... wasn't effected too badly as most of the extra width goes out - tyre/rim combination fills the wings quite nicely.

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Are you sure that you have your offsets calibrated correctly?

The Disco I 7" rim has a positive offset (goes in).

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Originally Posted by Lotz-A-Landies

Are you sure that you have your offsets calibrated correctly?

The Disco I 7" rim has a positive offset (goes in).

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Since when do you calibrate offsets? Whatever the case (positive or negative) the rim/tyre combination seems to fill the wings quite nicely, unlike SWB rims and 7.50 which always looked too far in.

Anyway, I once did a comparison of various LR rims (wolf, disco 1, LWB and SWB) to see where the extra width of rims go and (I need to find my spreadsheet) there wasn't much of a difference in the distance between the wheel mounting surface to the inner edge of rim between the various rims - called BACKSPACE. This means that the extra width of the most of the rims would have to go outwards.

The problem with my mates Series 3 SWB is that it had a buggered rim that must have been hit with incredible force by the previous owner.

That leaves it with only 4 original Series 3 rims on it and no spare.

I've been told that the Series rims are hard to come by - would the steel rims on most County's and base Defender's fit the 7.50X16 tyre without increasing turning circle?

I like the idea of putting bigger radial tyres on it, as long as I can keep speedo accuracy.

Robbie
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1954 86" Series 1 Soft-Top
1965 88" Series 2A Hard-Top
1975 109" Series 3 Trayback Ute
1981 109" Series 3 Stage 1 V8 Station Wagon
1995 Discovery 1 V8i
1999 Defender 110 Xtreme TD5

I changed all four of my series models I owned to 7.50x16's or 235/85/16's and all four were the better for it.Series are very easy to work on. Pat

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Originally Posted by Indiana Jones

I've been told that the Series rims are hard to come by - would the steel rims on most County's and base Defender's fit the 7.50X16 tyre without increasing turning circle?

I like the idea of putting bigger radial tyres on it, as long as I can keep speedo accuracy.

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Pretty much all Series and Defender rims are interchangeable, including Wolf rims as well as D1 steel rims. As for speedo accuracy - LWB Series speedos were calibrated for 7.50s which is almost the same diameter as 235/85s. SWB were calibrated for smaller tyres (6.50s?) and I think (someone can correct me) 205s were a good match.

There ways of correcting speedos and I am sure someone here knows how. My SWB runs of 235/85 with the speedo being out, but that never worried be a bit.

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Originally Posted by Turtle61

Pretty much all Series and Defender rims are interchangeable, including Wolf rims as well as D1 steel rims. As for speedo accuracy - LWB Series speedos were calibrated for 7.50s which is almost the same diameter as 235/85s. SWB were calibrated for smaller tyres (6.50s?) and I think (someone can correct me) 205s were a good match.

There ways of correcting speedos and I am sure someone here knows how. My SWB runs of 235/85 with the speedo being out, but that never worried be a bit.

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All Landrovers up to (but not including) D2 plus all Defender after that have the same stud pattern. A lot of the alloys though, will not fit with Series (or early 110/Defender rear) drums, and some will not fit over the hubs without cutting out the centre (particularly RRclassic). Also, in some cases the studs will not be long enough for alloys. Offsets are a bit of a mixed bag - generally speaking wider rims have at least part of the extra width inwards, limiting steering, but late S3 lwb and 110/Defender wheels have less offset inwards than earlier lwb wheels, and restrict steering less.

Swb speedos are calibrated for about 6.50 as you say, although 600 was standard. 205s are, as you say, a close match.

John

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Originally Posted by Indiana Jones

I like the idea of putting bigger radial tyres on it, as long as I can keep speedo accuracy.

Robbie

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Robbie,
Do you have any evidence that your speedo is accurate now?
If it is I'd put it down to good luck more than anything else.

Tony