[Ridge]

i have come across a set of 36" simexs and im just wondering how they would go on a sierra, would they bag with the low weight? do they handle rocks better then the smaller simexs with the extra "rib" in the middle?



i was thinking with beadlocks and tubes they might be ok?

[Rusho]

I reacon they would be fine




























I'll be honest....I wouldn't have a clue, I jut wanna see 36' tyres on your zook

[shep]

jimbo has 37's on his and they seem to work ok.

[tanshi]

i have a hard time getting 32" simexs to bag i wouldnt think that 36s would be any better.

If your driving rocks i wouldnt recomend them, much better tyres out there in a 36 for rocks and dry stuff.

[Ridge]

I do a bit of everything, but when its muddy they seem to be the tyre of choice. they are also at a pretty good price for the set

Jimbo has mtrs doesn't he?

I was also thinking about treps, swampers or km2s but ill need to save more for them, i haven't found any of those 2nd

[31zook]

don't buy them. 6ply walls make it not even bag on a 2.5T toyota surf.

[ajsr]

thats what beadlocks are for
all tires bag at 3-4 psi after a run or two

[Zook_Fan]

my mate ran the 36's on his hilux than transfered them over to his SWB patrol. He would run them at 10psi all the time, on road and everything, and they did not bag any more than if they were at 36psi. on a sierra you would need beadlocks and like 2 psi to get anything

[alien]

after recently getting a flat (31" ETs) they didnt bag until literally like 1 or 2psi...

i let mine down to around 8-10psi without beadlocks (i run tubes though) and they do bag a little, but nothing worth noting.

They are horrible on loose rock too =)

[MrRocky]

My maxxis with 3mm of tread perform better on the rocks the the simex's
in the mud and clay however they are awsome.

[Red89]

My 32 inch Pedes have served me well on rocks and mud, to the point were I am reluctant to change tyres. They do occassionally suffer from leaky beads, I do have an annoying leak on the inside bead of a rear tyre They dont bag as well as other tyres, but seem to grip well enough. If you can get them cheaper then other 36's then I would probably get them.

[royce]

what do you lot all define a tyre bagging as?

I think youll find a simex and other decent tyres will hold up in the sidewall really well but the tread surface will deform around terrain really well, whats the point in big tyres if you want the sidewall to collapse and get holes in it and lose diff clearance?

[atari4x4]

has anyone measured the tread lenght when airing down their simex's to see how much they've grown?

[alien]

nope... but it wouldnt be much i wouldnt think. lol

i LOVE that simex tyres are oversized though. as in, you buy a 31, you get 32.1 or something... and all the other sizes are about the same - like they measured it to the canvas, not the end of the tread to get their measurement of 31... which is brilliant.

When my simex's wear out ill definitely be getting a different tyre - the simex are great, but only in either super slop or grippy rock... anything in between they're just terrible. I'd happily sacrifice some wet clay grip in favour of more grip on rocks.

[atari4x4]

can you measure one at road going pressure & one at offroad pressure?

[ajsr]

the tread area in contact with the ground on my 34 ltb swampers more than doubles going from 20psi to say 6 psi with hradly any noticeable side wall bagging. if you then drop them to say 3psi that tread area nearly increases by half again but the sidewalls then noticably bag on the sides.

I find it very hard to belive that a simex would not have an measurable increase in tread area contact patch after being properly aired down to say sub 10 psi.

Also the more you use them at really low air pressures the more supple they seem to get.

I really belive its a waste of time running these tires without beadlocks of some sort as the desireable pressures I feel are sub 6 psi and you wouldnt want to do that too much on stock rims

I read somewhere that some yanks break them in by letting them down basicly just on flat and then driving on them until hot, this supposedly really softens them. sounds scarey I recon

[alien]

i can try do a measurement, sure... how are you measuring your contact patch so i can reproduce the circumstances?

Oh and im not denying the contact patch increases, just saying that 10psi is not low enough for a simex to noticably bag (even bouncing up rocks they dont bag!). So essentially im saying the same as ajsr - you'd ned beadlocks to get any real joy out of airing them down.

Here's a vid bouncing up rocks - check the tyres, theyre at 8-10psi: http://www.youtube.com/watch?v=D65v1AZNppI

[atari4x4]

slide 2 straight edges under the front & back edge of the tyre, square them up & measure the distance they're apart. reduce the tyres & remeasure.

thanks alien!

[Ridge]

royce wrote:

what do you lot all define a tyre bagging as?

I think youll find a simex and other decent tyres will hold up in the sidewall really well but the tread surface will deform around terrain really well, whats the point in big tyres if you want the sidewall to collapse and get holes in it and lose diff clearance?

Well my definition of bagging is that the tread surface, is able to deform to match the terrain and that the side wall softens a little bit increasing the tread area. I thought with a very stiff side wall that the tread surface would not increase as much

I would defineately be getting bead locks and probably tubes no matter what tyres i do get.

[Red89]

I have had mine down to 5 psi without them falling off and the other weekend I was doing around 90kph, cornering at 40 odd with 10 in the front and 8 in the back with the only dramas being leaky beads. I have never had my beadlocks fitted.

In the vid below they are at 6psi, yes they struggle but I attribute that as much to a lack of wheelbase, diff gearing and a dodgy carby requiring high reving as I do to a lack of grip. The step is between 3 and 4 foot high and I did make it up in the end without too much packing. The vid is long but you can see them 'bagging' at times, particularly when the wieght is on them.

http://s92.photobucket.com/albums/l36/8 ... odyay1.flv

[MrRocky]

the simex's at 8psi still look and behave like they are at 20 psi on rocks
i'm sure alien will agree

[alien]

Red89 - in the end it was momentum that got you up - not the tyres... lol and thats the issue i have with mine on that kind of surface.

Mick is running almost bald maxxis buckshots or something and side by side on the same track - i had a LOT more trouble than him getting traction.

He even drove a section where i was just sitting there spinning all 4 wheels and needed pulling out of - it was that big of a difference!

Yes, the simex do bag on compression - but really, it was under the full weight of the zuk on both back wheels at about 5km/hr impacting a rock... without doing the maths, im betting thats a LOT of weight hitting those rears to get not much bagging in the tyre.

i do this a lot - but i only have one comparison point for 31" tyres on my zuk and thats my previous tyres, cooper STTs... on rock like you drove there i'd give them a 8/10 for climbing up. I'd give the simex about a 5 in the same situation - honestly! Theyre made for muddy hill climbs, that was their pure intent when they were created, and they absolutely excel at that. I still think theyre a brilliant tyre - just not ideal for the varied terrain we get in WA, thats all. =)

[Red89]

Each to their own, as I said for a mud based tyre I am happy with how they've performed on rocks on my car and I'll be running them again at Mud Guts this year

[steve]

Ridge wrote:

i have come across a set of 36" simexs and im just wondering how they would go on a sierra, would they bag with the low weight? do they handle rocks better then the smaller simexs with the extra "rib" in the middle?



i was thinking with beadlocks and tubes they might be ok?

got them on yet? where's the pics?

[alien]

Im thinking swamper SSR's next:


They look like they will still do great in mud but be better on rocks than the simex. Price would be the limiting factor though as i dont know what theyre worth! lol

[Ridge]

i did not end up getting the simexs, they were on OL if anyone is interested http://www.outerlimits4x4.com/ftopic208926.php. Im finally about to get the diffs under the ute, so ill be getting tyres soon