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Tyres to replace STD Grandtrek's

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uk_vette
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PostPosted: Thu Jan 17, 2008 20:07    Post subject: Tyres to replace STD Grandtrek's Reply with quote

Well, here go's another question.
I have the OEM Dunlop Grandtrek on my LC3.
As you will known they are 17 inch, and as such there are quite a few limitations on tyre sizes.

Have you guy's fitted taller tyres to your 17 inch rims, or did anyone drop a rim size to 16 inch and then fit a taller tyre.

Am I correct in saying, with a minor touch of the angle grinder on the bottom of the brake caliper, to slightly increase the clearance between the caliper and the inside of the rim.

Or am I talking  bs   ?
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120man
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PostPosted: Thu Jan 24, 2008 20:15    Post subject: Reply with quote

I simply changed the tyres to BFG All Terrain: 265 70 R17.

Increases the overall diameter of the tyre by about 1 inch and thus produces slightly higher gearing: the speedo is now pretty much spot on per GPS.

Work well on and off road but be sure to rotate the tyres per the manual every 3000 or so miles.
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boonie
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PostPosted: Thu Jan 24, 2008 21:49    Post subject: Reply with quote

why do you have to rotate the tyres.just put general mud pluggers on mine,been told their a realy good tyre on and off road.
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120man
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PostPosted: Fri Jan 25, 2008 0:02    Post subject: Reply with quote

So you even out the wear pattern.

The front nearside tyre will always tend to wear more on the outside edge than the others because in the UK we tend to spend quite a bit more time turning right rather than left thanks to roundabouts.

The front offside also wears on the inside edge for the same reason.

Over time they get rounded off and the steering feels less sharp and ultimately the tyres wear unevenly and you have to replace them sooner.

The other issue is that with big chunky tyres you can get 12mm of tread or more. Never use the spare and over time you end up with a tyre that in theory could be 12mm -1.6mm (legal limit) X 2 bigger in diameter than the others:  over 20mm.

May not sound a lot but get a puncture and stick it on (assuming you can because the wheel nuts may have rusted in place by then!) and all of a sudden one of the wheels on your wagon is bigger than the others and has very different handling characteristcs.

Also means the Diff. will be working overtime even when going in a straight line because the new wheel will want to go further per rotation than the others, in the case of 265 70 R17 tyres about 2.5 inches per rotation.

That might not sound like much but over one mile the "new" tyre would want to be 45 yards in front of the old ones.

If you do want to rotate on a regular basis get a decent trolley jack: 3 ton capacity minimum. The jack supplied is both useless and dangerous IMO.
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PostPosted: Fri Jan 25, 2008 19:55    Post subject: Reply with quote

A good explanation, when i got my lc auto it had different size tyres on the front & back & it would not freewheel when you took your foot off the gas,  A new set of tyres & problem gone.


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PostPosted: Fri Jan 25, 2008 19:56    Post subject: Reply with quote

thanks for that 120 man after all that info will definently be rotating tyres regulary.
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Landcrusher
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PostPosted: Fri Jan 25, 2008 22:31    Post subject: 16s or 17s Reply with quote

You can't get 16" rims on.. I tried on mine. The brake caliper is too large. 4x4 up at Leeming Bar had a go for me. No chance.

I wanted some winter tyres on a steel rim - turns out that no-one does a 17" steel that will fit a Cruiser

LC
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Landcrusher
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PostPosted: Fri Jan 25, 2008 22:36    Post subject: 120 Guru Reply with quote

By the way 120 man. Wise words. Great post.

Thanks to the huge footprint, great sound insulation and BFGs superior technology, have no fears about fitting AT or MT. They are not noisy. Unless you really really want to play in the deep brown stuff, ATs will get you through most surfaces in my experience - having had both.

LC
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120man
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PostPosted: Fri Jan 25, 2008 23:33    Post subject: Re: 16s or 17s Reply with quote

Landcrusher wrote:
You can't get 16" rims on.. I tried on mine. The brake caliper is too large. 4x4 up at Leeming Bar had a go for me. No chance.

I wanted some winter tyres on a steel rim - turns out that no-one does a 17" steel that will fit a Cruiser

LC


You can get 16" rims on. But have to take a grinder to the brake calipers!
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Landcrusher
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PostPosted: Fri Jan 25, 2008 23:45    Post subject: get busy with the grinder Reply with quote

And are we happy with this?

Mine was actually a company car, so grinding bits off, even by running over parts of Yorkshire was sort of frowned upon. If it's a tad or a smidge, well fine, but advocating riving huge chunks off your caliper may not be good for the MOT etc. Can you quantify how much you need to remove? And from where. There may not be many garages that would be prepared to do this, so if you are not handy with the magic spinning disc, you may have difficulty. I ran a fettling shop for several years specialising in automotive castings, so I'm quite happy, but a mistake could be costly.
Photo would be handy 120.

Regards

LC
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120man
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PostPosted: Sat Jan 26, 2008 1:08    Post subject: Reply with quote

It is an Australian habit driven by the desire to fit 16 inch steel rims.

Not something I would do nor advise anyone to try but what has to be taken off varies from rim to rim. Only 1 or 2mm in some cases but other need 4mm, which seems a lot to me. Gets trimmed off the top of the caliper body where there is a moulding line and said to be quite a bit of "spare" metal,

http://www.pradopoint.com/viewtopic.php?t=824&highlight=
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TonyS
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PostPosted: Mon Jan 28, 2008 20:35    Post subject: Reply with quote

Hi,i run 265 75 17 cooper STs on ours,it gets a lot of use off road around the farm, and they are great,much better off road than a BFG AT.
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120man
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PostPosted: Tue Jan 29, 2008 0:56    Post subject: Reply with quote

Yes, some of the Coopers tyres are really good off road.

The BFG All Terrians are more of a general purpose offering so will always be at a disadvantage to the chunkier offerings off road. But they are a good all rounder

Easy solution: second set of wheels/tyres!
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uk_vette
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PostPosted: Thu Feb 21, 2008 11:49    Post subject: Reply with quote

120man wrote:
I simply changed the tyres to BFG All Terrain: 265 70 R17.

Increases the overall diameter of the tyre by about 1 inch and thus produces slightly higher gearing: the speedo is now pretty much spot on per GPS.

Work well on and off road but be sure to rotate the tyres per the manual every 3000 or so miles.
.
.
Great answers,
Would there be any interest in fitting larger tyres than 265 70 R17 ?

I would be looking at a wider and taller tyre for sand driving?
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df1603
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PostPosted: Sat Apr 05, 2008 19:40    Post subject: Reply with quote

do you have any experience with Kumho KL71? Apparently these are very popular mud tyres these days with great reviews online.
I am trying to decide between cooper stt and kumho kl71 for my off road set of 17" wheels....any thoughts?
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