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  #13  
Old 09-19-2013, 09:43 AM
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Re: Off Road 18"s

Thanks Doug. I went through the Cooper range early on when I was just looking for myself, skipping the AT3's in favour of their more agressive options. I must have missed the AT3 when I came back to "complete" the list.

They are certainly worthy of inclusion, especially given their close to OEM size. I can't edit my first post again, so once all my oversights are pointed out I'll re-post fully amended.

Thanks again,
Steve
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  #14  
Old 09-20-2013, 02:39 AM
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Re: Off Road 18"s

Quote:
Originally Posted by lt4vette View Post
With the TPMS, probably the only way is to look at an OEM wheel with the tyre off, and the potential aftermarket, and try to compare them. The only thing I can think of is the width of the "ledge" the valve stem goes through, or the angle of it so the sensor doesn't get in the way during tyre removal. Jeep are VERY specific about how to remove and replace a tyre - so much so I'd be amazed if Bob Janes' followed the procedure.
Thanks, Russell
The Tyre and Rim Association of Australia is quite specific on rim and tyre dimensions. However, with regard to TPMS, on page F-3 of their 2014 manual, they state,
"The Tyre and Rim Association has not approved a standard for tyre pressure monitoring sensor device envelope. The device manufacturer and installer must ensure that the device does not interfere with tyre mounting/dismounting or cause tyre damage."
This implies that all Aussie "legal" rims and tyres are made to the same standard and TPMS's are simply made to fit. One must assume that Jeep rims meet that standard but then there are no guarantees where Fiat Chrysler Australia are involved.
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  #15  
Old 09-20-2013, 02:57 AM
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Re: Off Road 18"s

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Originally Posted by BobT View Post
The Tyre and Rim Association of Australia is quite specific on rim and tyre dimensions. However, with regard to TPMS, on page F-3 of their 2014 manual, they state,
"The Tyre and Rim Association has not approved a standard for tyre pressure monitoring sensor device envelope. The device manufacturer and installer must ensure that the device does not interfere with tyre mounting/dismounting or cause tyre damage."

This implies that all Aussie "legal" rims and tyres are made to the same standard and TPMS's are simply made to fit.
I don't see that written there Bob. It says there is no standard sensor mounting base shape. It says the sensor must be clear of tyre mounting equipment. That is all.

So whether the Grand Cherokee TPMS sensors fit an untested aftermarket rim is unclear until inspected (measured) or trial fit.

That's my take anyway.

Cheers,
Steve
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  #16  
Old 09-20-2013, 03:24 AM
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Re: Off Road 18"s

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Originally Posted by Barboots View Post
I don't see that written there Bob. It says there is no standard sensor mounting base shape. It says the sensor must be clear of tyre mounting equipment. That is all.

So whether the Grand Cherokee TPMS sensors fit an untested aftermarket rim is unclear until inspected (measured) or trial fit.

That's my take anyway.

Cheers,
Steve
Jeep doesn't seem to be confident that the sensor will remain clear of tyre changing equipment (from wk2jeeps):

"4. Mount tire on wheel following tire changer manufacturers instructions, paying special attention to the following to avoid damaging tire pressure sensor:
a. Rotating Wheel Tire Changers - Once the wheel is mounted to the changer, position the sensor valve stem (2) approximately 280 from the head of the changer (located at 1) in a clockwise direction before rotating the wheel (also in a clockwise direction) to mount the tire. Use this procedure on both the outer and inner tire beads.

b. Rotating Tool Tire Changers - Position the wheel on the changer so that the sensor valve stem (1) is located approximately 210 clockwise from the installation end of the mounting/dismounting tool (2) once the tool is mounted for tire installation. Make sure the sensor is clear of the lower bead breaker area (3) to avoid damaging the sensor when the breaker rises. Rotate the tool (2) in a counterclockwise direction to mount the tire. Use this procedure on both the outer and inner tire beads."

nterstingly, the only tyre change I have had on wheels with TPMS they broke one of the two sensors - and that was at the dealer.
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  #17  
Old 09-20-2013, 04:01 AM
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Re: Off Road 18"s

I think any TPMS equipped wheel is going to require this kind of attention. Having the pressure point of the mounting equipment not pass the sensor is going to apply across the board.

Part of need for this cautionary note is in response to the care factor of the average fitter... which will be none. The job has to be spelt out precisely.

Steve
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  #18  
Old 09-20-2013, 03:58 PM
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Re: Off Road 18"s

Quote:
Originally Posted by Barboots View Post
I think any TPMS equipped wheel is going to require this kind of attention. Having the pressure point of the mounting equipment not pass the sensor is going to apply across the board.

Part of need for this cautionary note is in response to the care factor of the average fitter... which will be none. The job has to be spelt out precisely.

Steve
I just noticed this:

The TPM sensors are designed for original style factory wheels. It is not recommended to install a tire pressure sensor in an aftermarket wheel. (This could cause sealing and system performance issues.)

Its not talking about damage as I thought, but is even harder to explain imo.

Russell
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Old 09-21-2013, 02:13 AM
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Re: Off Road 18"s

Quote:
Originally Posted by Barboots View Post
I don't see that written there Bob. It says there is no standard sensor mounting base shape. It says the sensor must be clear of tyre mounting equipment. That is all.

So whether the Grand Cherokee TPMS sensors fit an untested aftermarket rim is unclear until inspected (measured) or trial fit.

That's my take anyway.

Cheers,
Steve
What I'm saying is that all rims should be standard. It would still be wise to check regardless.
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  #20  
Old 09-21-2013, 02:54 AM
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Re: Off Road 18"s

Can someone who has the Bridgestone D697 in 265/60/18 measure the actual tread width please.
I have just measured BF Goodrich in 265/70/17 (on a Prado) and the tread width was 220mm, not 265mm, so want to know what the D697 are.

Could someone who has the Yokohama A/T3 (I think Sparky has these) do the same please.

I wonder what the tread width of the Bridgestone D697 in 285/60/18 is?

If there are any others with different brands that could do the same it might help.

Thanks.
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Old 09-21-2013, 04:24 AM
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Re: Off Road 18"s

Quote:
Originally Posted by Zillajnr View Post
Can someone who has the Bridgestone D697 in 265/60/18 measure the actual tread width please.
I have just measured BF Goodrich in 265/70/17 (on a Prado) and the tread width was 220mm, not 265mm, so want to know what the D697 are.

Could someone who has the Yokohama A/T3 (I think Sparky has these) do the same please.

I wonder what the tread width of the Bridgestone D697 in 285/60/18 is?

If there are any others with different brands that could do the same it might help.

Thanks.
On the tirerack.com site they have all the tyre dimensions including treadwidth (which is invariably different to the section width (eg 265) which is sidewall to sidewall on a specified rim size).
Unfortunately, they don't seem to sell the D697, but maybe the D695 is similar. Click on the tyre and then the "specs" tab.
I had a problem with the inner edge of my rear tyres on another car scrubbing, and changed from one brand to another , with a 20 mm treadwidth reduction (both 255/35/18's), and the problem disappeared!
Russell
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Old 09-22-2013, 01:15 AM
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Re: Off Road 18"s

Quote:
Originally Posted by BobT View Post
What I'm saying is that all rims should be standard. It would still be wise to check regardless.
Nope... there's definitely not a standard profile where the TPMS sensor seats on the inner rim. I've heard this directly from my long term tyre contacts regarding my current Jeep 18"s project, and none of the quoted materials indicates any form of TPMS standards. I reaffirm with the previous quote "The Tyre and Rim Association has not approved a standard for tyre pressure monitoring sensor device envelope."

I am not trying to be a hard @rse on this, it's just that I want everyone to understand it is more likely that your TPMS module will not fit on your aftermarket rims, than the possibility that they will.

Additional testament is that many 18"s are being sold complete with tyres and TPMS. I can only assume that the TPMS sensor would not seat safely on their new rim purchase. This was flagged to me immediately by the tyre franchise I have used and referred for many years.

Cheers,
Steve

PS: I forgot to refer to Russell's extremely relevant find "The TPM sensors are designed for original style factory wheels. It is not recommended to install a tire pressure sensor in an aftermarket wheel. (This could cause sealing and system performance issues.)" I gather this is direct from Jeep literature.
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Old 09-22-2013, 01:15 AM
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Re: Off Road 18"s

Quote:
Originally Posted by Zillajnr View Post
Can someone who has the Bridgestone D697 in 265/60/18 measure the actual tread width please.
I have just measured BF Goodrich in 265/70/17 (on a Prado) and the tread width was 220mm, not 265mm, so want to know what the D697 are.

Could someone who has the Yokohama A/T3 (I think Sparky has these) do the same please.

I wonder what the tread width of the Bridgestone D697 in 285/60/18 is?

If there are any others with different brands that could do the same it might help.

Thanks.
For the D697 265/60R18 LT, the tread width measures at about 225 and the secion width (side wall to side wall) is between 260 and 265 as good as I can measure. The first number in a tyre size is supposed to be the section width of a normally inflated tyre.
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  #24  
Old 09-22-2013, 03:28 AM
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Re: Off Road 18"s

Quote:
Originally Posted by Barboots View Post
Nope... there's definitely not a standard profile where the TPMS sensor seats on the inner rim. I've heard this directly from my long term tyre contacts regarding my current Jeep 18"s project, and none of the quoted materials indicates any form of TPMS standards. I reaffirm with the previous quote "The Tyre and Rim Association has not approved a standard for tyre pressure monitoring sensor device envelope."

I am not trying to be a hard @rse on this, it's just that I want everyone to understand it is more likely that your TPMS module will not fit on your aftermarket rims, than the possibility that they will.

Additional testament is that many 18"s are being sold complete with tyres and TPMS. I can only assume that the TPMS sensor would not seat safely on their new rim purchase. This was flagged to me immediately by the tyre franchise I have used and referred for many years.

Cheers,
Steve

PS: I forgot to refer to Russell's extremely relevant find "The TPM sensors are designed for original style factory wheels. It is not recommended to install a tire pressure sensor in an aftermarket wheel. (This could cause sealing and system performance issues.)" I gather this is direct from Jeep literature.
Thanks Steve. The quote is from the TPMS discussion on the wk2jeeps.com site. The whole article is about how it works, where the receiver is, what to do when you change the sensors etc - interesting read for someone like me who didn't know much about it.
Russell
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