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Alan
Joined: Thu Oct 10, 2019 8:30 pm Posts: 42
Vehicle: Sierra SJ410
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 Posted: Thu Oct 17, 2019 3:37 pm |
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Hi. The rims fitted at present (Sunraysia style) with 235 / 75 R15 tyres hit the springs on near full lock. I think the rim offset is incorrect. The local tyre place I usually deL with catalogues dont go back to 1981. What offset rim do i need and with the correct offset will a set of 235 / 75 R15 all terrain tyres clear the springs?
Regards Alan
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Gwagensteve
Joined: Thu Feb 26, 2009 10:30 pm Posts: 13007 Location: Melbourne
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Posted: Fri Oct 18, 2019 7:17 am |
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Rim offset is likely “correct” the problem is you’re trying to fit a tyre and wheel that’s beyond what the car was designed for.
You probably want an offset of around -10 for a 6” rim, which will be hard to find.
-13 for a 7” rim is common, but 7” is a bit wide for a 235.
It’s hard to avoid tyre/spring contact on a narrow track car with larger tyres.
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Alan
Joined: Thu Oct 10, 2019 8:30 pm Posts: 42
Vehicle: Sierra SJ410
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Posted: Fri Oct 18, 2019 4:02 pm |
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So if i can find some 6" rims with the correct offset then i should stick with 205/70 R15 tyres.
Regards Alan
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alien
Joined: Wed Mar 24, 2010 10:30 pm Posts: 16343 Location: Perth
Vehicle: '92 Sierra, 1.6efi, SPOA, 31s.
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Posted: Fri Oct 18, 2019 6:39 pm |
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You could always take the path of custom rims - get the current ones chopped and set at an offset that's right for your 235s...
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Alan
Joined: Thu Oct 10, 2019 8:30 pm Posts: 42
Vehicle: Sierra SJ410
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Posted: Fri Oct 18, 2019 8:16 pm |
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The rims are rusty. Just as cheap to get new rims then to sandblast and powdercoat. Existing 235 tyres are semi worn out, so all new is the go.
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vet 180
Joined: Mon May 05, 2014 11:50 am Posts: 1246
Vehicle: Vitara 1994
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Posted: Sat Oct 19, 2019 3:35 am |
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Alan wrote: The rims are rusty. Just as cheap to get new rims then to sandblast and powdercoat. Existing 235 tyres are semi worn out, so all new is the go. I run 215/80R15 Yokohama geolander ATS’s and these are awesome on light weight zuks. I have run 235/75 BFG KO’s on a Sierra before and run the geo’s on the Jimny. Would take the geo’s everyday of the week and twice on Sunday’s. The Geo’s are much lighter, they are SL rated vs LT, the sipping on them works really well in rocks and terrain you need the face of the tire to deform, the ground pressure and grip feels better. The only terrain I haven’t tested the geo’s is mud and to be fair to the KO’s they are pretty good in mid for an all terrain. I am sure the KO’s might be a little more resistant to punctures etc, however that is not an issue in our cars, tire weight is more important. Also ever off-road puncture I have ever had has been a side wall cut and I doubt the sidewalls are much tougher if any. I would first check if your interference on your spring in 10mm or less and I would guess so and check that spec Yokohama is readily available were you are. You won’t find a lot of info on the net, but they are a great sum AT tire. Sent from my iPhone using Tapatalk
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ZUZUKI
Joined: Thu Sep 02, 2010 5:50 am Posts: 427 Location: Melbourne
Vehicle: '85 Sierra LWB, '99 GV 2.5L
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Posted: Sat Oct 19, 2019 9:24 pm |
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A slight (well more than slight) bodge to stop tyres hitting springs - if all you can easily / cheaply / whatever find in wheels is the same as what you have already got, is to weld a nut onto the swivel housing seal bolt on either that act as the steering stops.
This will reduce steering lock = increasing turning circle, which is usually not too noticeable.
If the nut is too thick, grind small amounts off until you reach a point of just missing the spring on full lock.
If you don't like the loss of lock or find better suited wheels in the future, grind all of the nut off back to standard.
Rgs, Michael
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MrRocky
Joined: Thu Dec 17, 2009 10:30 pm Posts: 4731 Location: perth
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Posted: Sat Oct 19, 2019 10:09 pm |
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I normally take the spring retainer bolts out.
Seems to work ok on my nt running sierra rims with 30x9.5r15 only just touches on full lock but dpesnt cut into the tyre with bolts removed
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Alan
Joined: Thu Oct 10, 2019 8:30 pm Posts: 42
Vehicle: Sierra SJ410
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Posted: Mon Jan 20, 2020 4:04 pm |
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Hi. Still sprting out rims and tyres. I noticed that the wheels will turn further to the right then the left. With no rims on you can push the brake hubs so the wheels turn right until the back of the swivel joint hits the axle housing. Going the other way the steering box stops the movement with a 10mm gap between the swivel housing and the axle. ( have not fitted the felt and seal hold down clamps yet) . Pitman arm has never been removed from the steering box. As i am writing this i just had a thought that maybe the adjustable arm joinng the swivel joints is set too long. I will check this tomorrow and repost.
Alan
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Gwagensteve
Joined: Thu Feb 26, 2009 10:30 pm Posts: 13007 Location: Melbourne
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Posted: Mon Jan 20, 2020 6:06 pm |
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There is no adjustment other than removing the pitman arm and resetting it in the centre of the steering box travel with the wheels straight ahead.
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Alan
Joined: Thu Oct 10, 2019 8:30 pm Posts: 42
Vehicle: Sierra SJ410
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Posted: Wed Jan 22, 2020 7:21 pm |
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Hi. Today I fitted the felt seals to the swivels. As "Zuzuki" in a reply above alluded to the bolts holding the seals are the steering stops. With the bolts installed I now have less wheel movement lock to lock. I will see if the tyres still hit and if the do I will extend the head of the bolt to limit the swivel action.
Regards Alan
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