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Be careful choosing 140 tires on the OEM 4" rim


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TimeMachine

A timely warning about running some narrow-beaded tires on a 4" rim like the Motoz 140's. Not all tires will be affected like this, apparently the Pirelli Scorpion Rally 140 is fine, so will depend on the tire or the brand.

 

 

This happened to me a few months into ownership before I changed to a narrower 2.5" Excel rear rim. The tire went flat from a drill bit. Mid corner the tire pulled off the bead, the rear went very loose and could have thrown me off.

 

20200209_155943.thumb.jpg.c53ce48b860360df06ed15dbe945cf5f.jpg

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I will say though that I am big fan of the 140x18 Motoz Desert HT. I now run them on a 2.5"x18 rim and get about 5-6000 kilometers out of them before they have squared off sufficiently that I replace them.

 

I am currently doing some wear testing on this tire and hope to have more good things to say about it later, but wanted to post this for now.

 

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Seventh Son
22 hours ago, TimeMachine said:

A timely warning about running some narrow-beaded tires on a 4" rim like the Motoz 140's. Not all tires will be affected like this, apparently the Pirelli Scorpion Rally 140 is fine, so will depend on the tire or the brand.

 

This happened to me a few months into ownership before I changed to a narrower 2.5" Excel rear rim. The tire went flat from a drill bit. Mid corner the tire pulled off the bead, the rear went very loose and could have thrown me off.

 

20200209_155943.thumb.jpg.c53ce48b860360df06ed15dbe945cf5f.jpg

 

Appreciate the warning.  Just to be clear - This happened when you were running a Motoz 140 tire on the OEM wheel? 

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TimeMachine
6 hours ago, Seventh Son said:

Appreciate the warning.  Just to be clear - This happened when you were running a Motoz 140 tire on the OEM wheel? 

Correct. You can see it was with the original rim and how the tire reverted to it's natural width at the bead. The 2.5" Excel rim is that width so the tire is unlikely to pull off that rim.

There will be other brands of 140 tire with a similar problem, so best to check how the tire sits relative to the rim if you can (not sure if you can rely on recommendations from the manufacturers).

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Anyone thought about the idea of running slime (or equivalent product) not so much to prevent puncture but to buy you a few seconds of air in a major puncture? Does it actually work in that way?

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Seventh Son
On 2/23/2021 at 8:48 PM, TimeMachine said:

Correct. You can see it was with the original rim and how the tire reverted to it's natural width at the bead. The 2.5" Excel rim is that width so the tire is unlikely to pull off that rim.

There will be other brands of 140 tire with a similar problem, so best to check how the tire sits relative to the rim if you can (not sure if you can rely on recommendations from the manufacturers).

I was just researching tires for when it's time to replace my AX-41's and came across this video comparing 140 and 150 width tires (he also compares different front tires as well).  Kyle seems to be warning about the exact scenario that you experienced.  See right about the 4-minute mark where he starts discussing this:

 

 

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Seventh Son
16 hours ago, luke2152 said:

Anyone thought about the idea of running slime (or equivalent product) not so much to prevent puncture but to buy you a few seconds of air in a major puncture? Does it actually work in that way?

I've been running Ride-on tire sealant and balancer in all my bikes's tubes front and rear and so far have had no issues at all.  I haven't gotten any flats, and I like that I don't really have to balance my tires when I use this stuff.  I have no affiliation with Ride On. 

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TimeMachine
5 hours ago, Seventh Son said:

I was just researching tires for when it's time to replace my AX-41's and came across this video comparing 140 and 150 width tires (he also compares different front tires as well).  Kyle seems to be warning about the exact scenario that you experienced.  See right about the 4-minute mark where he starts discussing this:

 

 

Yeah, you can see the natural spacing between the beads on the 140 is much narrower. That doesn't mean that all 140's are unusable on the 4"rim. Other 140s will fit just fine (Shinko for example).

 

The other thing mentioned was the cross section profile of the tire and how much flatter it is when running a 140 on a wide rim. That is true, and it is very noticeable, but there would be no difference between running the 140 or 150 on the 4"rim. They are both very flat! You can see the flat profile on the 150 in the video.

 

To get the benefit of the better/smaller cross section on the 140 you need to use a narrower rim and then the handling of the bike improves a lot, and also better traction on loose or gravel surfaces.

 

The 140 is in my opinion the far better choice for off-road use, and cheaper, but should be done with a narrower rim to get all the benefits.

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