Tyres size options
-
- High Range 2WD
- Posts: 10
- Joined: Sun Feb 17, 2019 10:06 am
- Town: lausanne
- Vehicle: hilux 2.5 srx
- Real Name: Jose
Tyres size options
Hi guys
what's the biggest size tyre that can be fitted on a standard 15" hilux steel rim without having to do diff. modifications?
what's the biggest size tyre that can be fitted on a standard 15" hilux steel rim without having to do diff. modifications?
- pietpetoors
- Moderator
- Posts: 10650
- Joined: Thu May 17, 2007 9:12 pm
- Town: Langebaan
- Vehicle: 2.7 Hilux 4x4 DC
- Real Name: Pieter
- Club VHF Licence: X27
- Contact:
Re: Tyres size options
Depends on how strong your engine is.
I have seen some Hiluxes running 33" without suffering.
I have seen some Hiluxes running 33" without suffering.
Only Dead Fish Go With The Flow!
1999 Hilux 2.7i 4x4 Raider DC with 3.4 Prado V6. Rear diff-lock, Bull Bar and rock sliders, 31" Cooper ST Maxx, Snorkel, Alu-Canopy, VHF Motorolla radio, West Coast Rust, Mikem Suspension, Ball Joint Spacers in front and Mikem extended shackles at the rear, 25watt LED Spots
1999 Hilux 2.7i 4x4 Raider DC with 3.4 Prado V6. Rear diff-lock, Bull Bar and rock sliders, 31" Cooper ST Maxx, Snorkel, Alu-Canopy, VHF Motorolla radio, West Coast Rust, Mikem Suspension, Ball Joint Spacers in front and Mikem extended shackles at the rear, 25watt LED Spots
- Mud Dog
- Moderator
- Posts: 29858
- Joined: Tue Apr 29, 2008 2:18 am
- Town: East London
- Vehicle: '90 SFA Hilux DC 4X4, Full OME, 110mm lift. Brospeed branch, 50mm ss freeflow exhaust. 30 x 9.5 Discoverer S/T's on Viper mags. L/R tank. (AWOL) '98 LTD 2.4 SFA, dual battery system. Dobinson suspension, LR tanks, 31" BF mud's.
- Real Name: Andy
- Club VHF Licence: HC103
Re: Tyres size options
I'm running 33's on the one Hilux with V6 conversion and 31's on the other with standard 22R motor. Both with standard diffs and no problems. Speedo is spot on against GPS with 31's but the 33's give a significant under-reading.
I don't think the diffs are a problem with motors that don't deliver a lot of power / torque like a V8, but I think you're going to find the 2.5 to be sluggish and underpowered with 33's.
I don't think the diffs are a problem with motors that don't deliver a lot of power / torque like a V8, but I think you're going to find the 2.5 to be sluggish and underpowered with 33's.
When your road comes to an end ...... you need a HILUX!.
Life is like a jar of Jalapeño peppers ... what you do today, might burn your ass tomorrow.
Don't take life too seriously ..... no-one gets out alive.
It's not about waiting for storms to pass. It's about learning to dance in the rain.
And be yourself ..... everyone else is taken!
Life is like a jar of Jalapeño peppers ... what you do today, might burn your ass tomorrow.
Don't take life too seriously ..... no-one gets out alive.
It's not about waiting for storms to pass. It's about learning to dance in the rain.
And be yourself ..... everyone else is taken!
-
- High Range 2WD
- Posts: 10
- Joined: Sun Feb 17, 2019 10:06 am
- Town: lausanne
- Vehicle: hilux 2.5 srx
- Real Name: Jose
Re: Tyres size options
The engine is the 2kd 2.5 ...quiet sluggish. ... with 225/75R15 tyres at the moment !!!
Got stuck 2 times in deep sand with 1.8 bar pressure tyres? think maybe tyres too thin !!!
First time in Kaudum then in Mudum n.p
Got stuck 2 times in deep sand with 1.8 bar pressure tyres? think maybe tyres too thin !!!
First time in Kaudum then in Mudum n.p
- pietpetoors
- Moderator
- Posts: 10650
- Joined: Thu May 17, 2007 9:12 pm
- Town: Langebaan
- Vehicle: 2.7 Hilux 4x4 DC
- Real Name: Pieter
- Club VHF Licence: X27
- Contact:
Re: Tyres size options
For thick sand try 0.8 bar
Only Dead Fish Go With The Flow!
1999 Hilux 2.7i 4x4 Raider DC with 3.4 Prado V6. Rear diff-lock, Bull Bar and rock sliders, 31" Cooper ST Maxx, Snorkel, Alu-Canopy, VHF Motorolla radio, West Coast Rust, Mikem Suspension, Ball Joint Spacers in front and Mikem extended shackles at the rear, 25watt LED Spots
1999 Hilux 2.7i 4x4 Raider DC with 3.4 Prado V6. Rear diff-lock, Bull Bar and rock sliders, 31" Cooper ST Maxx, Snorkel, Alu-Canopy, VHF Motorolla radio, West Coast Rust, Mikem Suspension, Ball Joint Spacers in front and Mikem extended shackles at the rear, 25watt LED Spots
- Mud Dog
- Moderator
- Posts: 29858
- Joined: Tue Apr 29, 2008 2:18 am
- Town: East London
- Vehicle: '90 SFA Hilux DC 4X4, Full OME, 110mm lift. Brospeed branch, 50mm ss freeflow exhaust. 30 x 9.5 Discoverer S/T's on Viper mags. L/R tank. (AWOL) '98 LTD 2.4 SFA, dual battery system. Dobinson suspension, LR tanks, 31" BF mud's.
- Real Name: Andy
- Club VHF Licence: HC103
Re: Tyres size options
Your tyres are not the best for sand driving. The bigger the footprint in sand, the better. The footprint of a tyre is affected by the diameter but more so by the width, and then a bigger profile allows you more deflation which increases the footprint.
Yours are just over 28" in diameter, 225mm tread width and a profile height of just under 169mm.
By comparison a 31" tyre (31x10.5-R15 which your vehicle should still be able to handle), has a diameter of 31", tread width of 267mm and a profile height of just under 203mm. It may not seem much by direct comparison, but it's behaviour in sand is very significant, especially when deflated.
That's what I would fit taking into account your sluggish motor and fitment without any major modifications.
Otherwise you could look at 235/75-R15 tyres which have a diameter of just under 29", a tread width of 235mm (only 10mm more than yours) and a profile height of 176¼mm (just 7½mm more than yours). Not a huge difference and you probably won't notice too much difference in the "slugishness" of the motor in handling that size, but it will give you a little more deflation ability. It will make a difference in the behaviour of the tyre in sand, but will it be enough to keep you from getting stuck? Maybe, but I would still prefer the 31x10.5-R15.
33" would be even better but then your motor is really going to battle and you will need to do some more serious mods to get then to fit without fouling.
Then deflation ... as Pieter suggests, try going lower tyre pressures. 0.8bar as he suggests is ok, but I wouldn't like to run long distances with such a low pressure, especially in hot conditions. The continual tyre sidewall flexing creates heat of it's own and if it gets too hot it will fail .... then you're left with a shredded tyre. Run at 0.8 bar where you really need to but re-inflate to 1.2 bar for general sand driving.
Yours are just over 28" in diameter, 225mm tread width and a profile height of just under 169mm.
By comparison a 31" tyre (31x10.5-R15 which your vehicle should still be able to handle), has a diameter of 31", tread width of 267mm and a profile height of just under 203mm. It may not seem much by direct comparison, but it's behaviour in sand is very significant, especially when deflated.
That's what I would fit taking into account your sluggish motor and fitment without any major modifications.
Otherwise you could look at 235/75-R15 tyres which have a diameter of just under 29", a tread width of 235mm (only 10mm more than yours) and a profile height of 176¼mm (just 7½mm more than yours). Not a huge difference and you probably won't notice too much difference in the "slugishness" of the motor in handling that size, but it will give you a little more deflation ability. It will make a difference in the behaviour of the tyre in sand, but will it be enough to keep you from getting stuck? Maybe, but I would still prefer the 31x10.5-R15.
33" would be even better but then your motor is really going to battle and you will need to do some more serious mods to get then to fit without fouling.
Then deflation ... as Pieter suggests, try going lower tyre pressures. 0.8bar as he suggests is ok, but I wouldn't like to run long distances with such a low pressure, especially in hot conditions. The continual tyre sidewall flexing creates heat of it's own and if it gets too hot it will fail .... then you're left with a shredded tyre. Run at 0.8 bar where you really need to but re-inflate to 1.2 bar for general sand driving.
When your road comes to an end ...... you need a HILUX!.
Life is like a jar of Jalapeño peppers ... what you do today, might burn your ass tomorrow.
Don't take life too seriously ..... no-one gets out alive.
It's not about waiting for storms to pass. It's about learning to dance in the rain.
And be yourself ..... everyone else is taken!
Life is like a jar of Jalapeño peppers ... what you do today, might burn your ass tomorrow.
Don't take life too seriously ..... no-one gets out alive.
It's not about waiting for storms to pass. It's about learning to dance in the rain.
And be yourself ..... everyone else is taken!
-
- High Range 2WD
- Posts: 10
- Joined: Sun Feb 17, 2019 10:06 am
- Town: lausanne
- Vehicle: hilux 2.5 srx
- Real Name: Jose
Re: Tyres size options
Thanks Pieter-Andy for your comments (31"×10.5-R15) it will be. Maybe next thing to do is to look at fitting a 3.l engine with autobox.... would that be possible? ?
- Haboob
- Monster Truck
- Posts: 2484
- Joined: Thu Aug 11, 2011 9:57 pm
- Town: King Williams Town
- Vehicle: Hilux
- Real Name: Edge
- Club VHF Licence: HC129
Re: Tyres size options
When Driving 50 km from home, the bigger tyres with the bigger footprint would be fine.
The only problem, when you are over landing, you are driving long distances to use the longer profile, once in a blue moon.
The bigger tyres will slightly increase your consumption over the whole trip - as they will slightly drain power from your vehicle.
I drive the D-4D 3.0, on which I went slightly smaller than spek - to 245 X 15 X 75 - to get better over-all fuel consumption.
You should not have got stuck in Kaudum or Mudumu (Mudumu only has thick sane in the eastern part of the Park) on the pressures you were using,
unless you were towing, or did not maintain momentum, but, if you get stuck, all you need to do is lower tyre pressure.
I realize that with a heavily laden over landing vehicle, you may not be able to lower your tyres to o.8 bar, but first dropping to 1.5 or then 1.2,
should be more than enough to get you out most over landing situations, with a heavily loaded vehicle.
Should you be driving dunes, you would be advised to travel much lighter, so that your tyres can be let down lower.
I travel with a heavily laden camper so seldom deflate to less than 1.8 or 1.5 in extreme cases.
Driving the sandy/dune sections in the early mornings is more advise-able, when the sand is more compacted.
The sand becomes more aerated, as the sand is warmed by the sun later in the day, then becomes more difficult to drive.
I would stick with the tyres you have or go to 245 X 15 X 75, but even this small amount will increase your fuel consumption.
Safe Travels...
The only problem, when you are over landing, you are driving long distances to use the longer profile, once in a blue moon.
The bigger tyres will slightly increase your consumption over the whole trip - as they will slightly drain power from your vehicle.
I drive the D-4D 3.0, on which I went slightly smaller than spek - to 245 X 15 X 75 - to get better over-all fuel consumption.
You should not have got stuck in Kaudum or Mudumu (Mudumu only has thick sane in the eastern part of the Park) on the pressures you were using,
unless you were towing, or did not maintain momentum, but, if you get stuck, all you need to do is lower tyre pressure.
I realize that with a heavily laden over landing vehicle, you may not be able to lower your tyres to o.8 bar, but first dropping to 1.5 or then 1.2,
should be more than enough to get you out most over landing situations, with a heavily loaded vehicle.
Should you be driving dunes, you would be advised to travel much lighter, so that your tyres can be let down lower.
I travel with a heavily laden camper so seldom deflate to less than 1.8 or 1.5 in extreme cases.
Driving the sandy/dune sections in the early mornings is more advise-able, when the sand is more compacted.
The sand becomes more aerated, as the sand is warmed by the sun later in the day, then becomes more difficult to drive.
I would stick with the tyres you have or go to 245 X 15 X 75, but even this small amount will increase your fuel consumption.
Safe Travels...
HABOOB means "Dust Storm"
-
- High Range 2WD
- Posts: 10
- Joined: Sun Feb 17, 2019 10:06 am
- Town: lausanne
- Vehicle: hilux 2.5 srx
- Real Name: Jose
Re: Tyres size options
Hi Edge
I also drive with a camper on the back, like your one (just seen the photo ) the extended version, and yes was loaded in 3rd gear low (diff lock Not engaged) engine lost power, changed into 2nd ...too late. These tyres only done 13.000 km so i will just wear then down and change to slightly bigger tyres also for better clearence. Thank you for your reply
(By the way what modifications have you done to your hilux?)
I also drive with a camper on the back, like your one (just seen the photo ) the extended version, and yes was loaded in 3rd gear low (diff lock Not engaged) engine lost power, changed into 2nd ...too late. These tyres only done 13.000 km so i will just wear then down and change to slightly bigger tyres also for better clearence. Thank you for your reply
(By the way what modifications have you done to your hilux?)
- Johan Kriel
- LR 4WD Full Lockers
- Posts: 623
- Joined: Sun Apr 26, 2009 8:41 pm
- Town: Okahandja
- Vehicle: 2.5 SC 4x4
- Real Name: Johan kriel
- Location: Okahandja
Re: Tyres size options
I fitted BFG 245/75 right form the start. Was not bad, but eventually chipped the 2.5 to be able to overtake trucks easier.
But looked a bit too wide for the rim.
Johan Kriel
Legend 50
Legend 50
- pieta.swanepoel
- Low Range 4WD
- Posts: 118
- Joined: Wed Apr 19, 2017 1:21 pm
- Town: Cape Town
- Vehicle: 2017 Toyota Hilux 2.4 GD-6 SR 4x4 SC
- Real Name: Pieta
Re: Tyres size options
The standard 16" 2.5 steel rim is a 6J. Assume 15" might be similar. A narrow rim. Fitting wider (or to wide) tires will cause it to bulge.
The biggest problem with the 2.5 engine (even more so if you have the lower spec version of the 2.5) is that it has not power/torque at very low revs.
And if heavely loaded even more so. Especially under 2000 rpm.
I have fitted a Dastek UniChip to mine to eliminate that issue . Made a major change to how it drives.
Mine has similar outputs to the higher spec 2.5 that were fitted to the DC Hilux and Fortunner.
The biggest problem with the 2.5 engine (even more so if you have the lower spec version of the 2.5) is that it has not power/torque at very low revs.
And if heavely loaded even more so. Especially under 2000 rpm.
I have fitted a Dastek UniChip to mine to eliminate that issue . Made a major change to how it drives.
Mine has similar outputs to the higher spec 2.5 that were fitted to the DC Hilux and Fortunner.
Groot berge en lang grondpaaie
- Haboob
- Monster Truck
- Posts: 2484
- Joined: Thu Aug 11, 2011 9:57 pm
- Town: King Williams Town
- Vehicle: Hilux
- Real Name: Edge
- Club VHF Licence: HC129
Re: Tyres size options
Everything that is needed.Hi Edge
I also drive with a camper on the back, like your one (just seen the photo ) the extended version, and yes was loaded in 3rd gear low (diff lock Not engaged) engine lost power, changed into 2nd ...too late. These tyres only done 13.000 km so i will just wear then down and change to slightly bigger tyres also for better clearence. Thank you for your reply
(By the way what modifications have you done to your hilux?)
Send me an email to edgew60 at gmail dot com & I will send you everything that I have done.
You will have less power with bigger wheels...
Safe Travels
HABOOB means "Dust Storm"
-
- Monster Truck
- Posts: 5270
- Joined: Sun Aug 19, 2007 10:43 pm
- Town: Pretoria
- Vehicle: '02 'Lux KZ
- Real Name: Thabo
- Club VHF Licence: x223
- Location: Garsfontein
- Contact:
Re: Tyres size options
For a start just deflate more. Easiest and cheapest to experiment with.
And 225/75/15 is already bigger than the standard size, which was decent in offroad situations.
And 225/75/15 is already bigger than the standard size, which was decent in offroad situations.
'02 KZ 'Lux. Cooled. Chipped. Onca'd. Cherished!
If you are a diesel fan, raise your hand.
If you aren't raising your hand, raise your standards!
A 4x4 is merely a machine that enables you to get stuck further away from civilization.
If you are a diesel fan, raise your hand.
If you aren't raising your hand, raise your standards!
A 4x4 is merely a machine that enables you to get stuck further away from civilization.