Just had a set of 275 45 20 Grabber A/T fitted by Andy and his team at AJS tyres, very professional service and come highly recommended to any of you forum guys or girls that need new shoes at a great price. Ride has improved and no real noticeable increase in noise so far, tougher purposeful stance and fills the arches a lot more too  2003 BMW M5 - 5 Litres of V8 Optimax Slurping Goodness in Carbon Black

2013 SDV6 HSE Black Edition- Orkney Grey with Ebony & Ivory. LR Facelift RAI, Genuine G4 Expedition Rack, 4x Warn SBD-160 Spotlights, Warn 9.5XPS Winch, Mantec Underbody Protection and Sump Guard, Full Easy Lift Suspension Module, LR Light Guards, Light Force HTX230 Hybrid spotlights, 18” Compomotive PD1881 on 265/65/18 BF Goodrich KO2, ARB fridge, TuffTrek awning 😎

 2003 BMW M5 - 5 Litres of V8 Optimax Slurping Goodness in Carbon Black

2013 SDV6 HSE Black Edition- Orkney Grey with Ebony & Ivory. LR Facelift RAI, Genuine G4 Expedition Rack, 4x Warn SBD-160 Spotlights, Warn 9.5XPS Winch, Mantec Underbody Protection and Sump Guard, Full Easy Lift Suspension Module, LR Light Guards, Light Force HTX230 Hybrid spotlights, 18” Compomotive PD1881 on 265/65/18 BF Goodrich KO2, ARB fridge, TuffTrek awning 😎

Last edited by Buckster on Mon Oct 12 2015 10:54pm. Edited 1 time in total

Hi,
Thinking of getting a set of these too. I have 275 40 20 fitted, will the increased side wall to 45 make any difference to speedometer etc ?  2.7 HSE, Audi A6 Exec, Honda Accord Exec, Volvo 440, Volvo 360

Hi Fish,
From what I have read through on the forum I don't think it makes much difference but I'm no expert on this, hopefully someone will chip in to give you the answer you are looking for  2003 BMW M5 - 5 Litres of V8 Optimax Slurping Goodness in Carbon Black

2013 SDV6 HSE Black Edition- Orkney Grey with Ebony & Ivory. LR Facelift RAI, Genuine G4 Expedition Rack, 4x Warn SBD-160 Spotlights, Warn 9.5XPS Winch, Mantec Underbody Protection and Sump Guard, Full Easy Lift Suspension Module, LR Light Guards, Light Force HTX230 Hybrid spotlights, 18” Compomotive PD1881 on 265/65/18 BF Goodrich KO2, ARB fridge, TuffTrek awning 😎

The speedo would be under reading by about 3.6%. Given that it will be set to over read a little, I wouldn't think this would be an issue if you keep it in mind (In fact, it will probably give a closer reading to the true speed).  Visiting from DISCO3.CO.UK
2006 Discovery 3 TDV6 Auto HSE Zambezi Silver

Yes, the error is quite big, just had a look at an on line tyre bible and it look like I would need to get 275x45x19 to get a rolling circumference with an error of just 0.29%.
Looks like i'll be scouring the market for 19's and tyres when funds allow  2.7 HSE, Audi A6 Exec, Honda Accord Exec, Volvo 440, Volvo 360

I wouldn't worry about it. Look at it this way; If you're speedo were 100% accurate (which it won't be), then when it's reading 70, you'd be doing about 72.52 - Well below the 10% + 2mph suggested (and it is only suggested) tolerance used by the police.

The wheel size can be corrected in the CCF, but, I understand, this is a little difficult to get right on the older vehicles.

Of course, in the end, AT tyres on 20 inch rims is a bit of an oxymoron... Visiting from DISCO3.CO.UK
2006 Discovery 3 TDV6 Auto HSE Zambezi Silver

 2.7 HSE, Audi A6 Exec, Honda Accord Exec, Volvo 440, Volvo 360

Hi
Try this for size,

http://www.willtheyfit.com/index.php?width...53#content

Oxymoron I see where your coming from but I rather like the 20s, and for what I use my sport for they seem like an ideal tyre for my needs with a little more sidewall protection and some extra grip when the going gets tuff.  2003 BMW M5 - 5 Litres of V8 Optimax Slurping Goodness in Carbon Black

2013 SDV6 HSE Black Edition- Orkney Grey with Ebony & Ivory. LR Facelift RAI, Genuine G4 Expedition Rack, 4x Warn SBD-160 Spotlights, Warn 9.5XPS Winch, Mantec Underbody Protection and Sump Guard, Full Easy Lift Suspension Module, LR Light Guards, Light Force HTX230 Hybrid spotlights, 18” Compomotive PD1881 on 265/65/18 BF Goodrich KO2, ARB fridge, TuffTrek awning 😎

Yes, with the excellent tread life and less noticable economy decreases reported, it's never a bad choice.  Visiting from DISCO3.CO.UK
2006 Discovery 3 TDV6 Auto HSE Zambezi Silver

there is another thread on the GG AT's in the Off Roading section, just to say i have found them
brilliant on long trips and some serious off roading in Cape York, but very weak side walls have
leaned towards a number of punctures in the last two outings (3 in total), so you have to treat them
very daintily off road it seems.. Another Pommie Bar Steward down under

MY20 Defender 110 SE P400 Eiger/Ebony
MY10 3.0 RRS TDv6 Fuji/Ebony/Anigre

Thanks for the heads up Zilch I have PMd you about your RAI on your facelift RR Sport, I'm seeking some advice  2003 BMW M5 - 5 Litres of V8 Optimax Slurping Goodness in Carbon Black

2013 SDV6 HSE Black Edition- Orkney Grey with Ebony & Ivory. LR Facelift RAI, Genuine G4 Expedition Rack, 4x Warn SBD-160 Spotlights, Warn 9.5XPS Winch, Mantec Underbody Protection and Sump Guard, Full Easy Lift Suspension Module, LR Light Guards, Light Force HTX230 Hybrid spotlights, 18” Compomotive PD1881 on 265/65/18 BF Goodrich KO2, ARB fridge, TuffTrek awning 😎

One thing I have found with the GG AT is that it seems to be susceptible to embedding of stones in the tread blocks. Not just in the sipes but the actual rubber itself.

Just put a fresh set on mine as I couldn't source any Pirelli ATRs, sadly. I like the GG AT for its undoubted ability away from tarmac but it does seem to be a bit too soft at times when faced with stones. 2012 SDV6 - it's missing a couple of cylinders
2008 TDV8 - it was a labour of love and is much missed

I haven't noticed any stones embedded in the actual rubber yet but it seems to attract lots in the tread block sipes as you say. I'm amazed they can make a tyre that has such soft rubber yet last so long!?  2003 BMW M5 - 5 Litres of V8 Optimax Slurping Goodness in Carbon Black

2013 SDV6 HSE Black Edition- Orkney Grey with Ebony & Ivory. LR Facelift RAI, Genuine G4 Expedition Rack, 4x Warn SBD-160 Spotlights, Warn 9.5XPS Winch, Mantec Underbody Protection and Sump Guard, Full Easy Lift Suspension Module, LR Light Guards, Light Force HTX230 Hybrid spotlights, 18” Compomotive PD1881 on 265/65/18 BF Goodrich KO2, ARB fridge, TuffTrek awning 😎