Wheels, tyres and leaf motor

[Hickbeard]

Hi guys.

Bought the leaf motor kit with rim. Label on the rim says its a mavic xm319. I go to mavic.com and find the rim. On the site it says max tyre width of 47mm (1.85") but on the label on the rim it says max 2.3".[emoji2369]

The site also says its a road wheel and mid range off road.[emoji2357]

I've got a 1.95" on the back and it looks fine, not too oversized. [emoji848]

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[AngryBob]

If you are asking how big a tire can you fit on a given rim, the best answer is "it depends".

IMO as long as you can seat the entire bead of the tire evenly, and it stays there under pressure, then it should be OK.

One definite thing I have learned the hard way, is, most especially if you are pushing the envelope, do NOT repeat NOT use a foldable tire. BAD, BAD, very BAD idea. It can appear to seat correctly, but what will happen is that, presumably at a formerly folded point, the bead will come outside the rim edge, allow the tube to expand outside the tire, have a massive elongated blowout, and when the pressure reduces, the tire bead will retract inside the rim, faster than the eye can follow. Three tubes in a row, with two people watching carefully, in the bike shop, undetectable. Got a new tire that day, but very unfortunately, only one. Couple funny stories there but too long.

There is a lot of variation on both tires and rims, design and construction, to give a really hard answer. Oversize tires can add a bit of suspension to a road bike, so I have tried quite a few variations.

 

[E-HP]

"A" = all road
"XM" = cross mountain

I think you can squeeze a 2.2" onto a 19mm mountain bike rim.

 

[MadRhino]

Good choice of rim for the standard power of the leaf motor. When one plans to feed it high power though, it is better to order the motor alone and lace it in a tough rim, higher hardness grade alu or at least, heavier.

 

[MadRhino]

This is not one of my own, but the recent experience of a friend who bought one of my older bikes, the Demo 8 with Cromotor. I guess he will not mind that I relate his experience here as an example.

He was riding fast in the grass crossing a park and hit this square steel tubing, about 5’’ out the ground. Managed to clear the front but hit it square with the rear.



6 broken spokes, one inch hole in the tire, but the rim (Sun MTX 39) still as new.



Half an hour repair with locally available shopping list.

 

[Davidcroatia]

Hello which set did you buy ?

 

[Hickbeard]

@AngryBob this will be road but didn't want skinny arse road tyres.

Got a kenda k1152 on back so will look to order the same for front.

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[Hickbeard]

@MadRhino urgh man. That's bad. Lucky it was just that

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[Hickbeard]

Hello which set did you buy ?

Which set? Of wheels? Haven't bought one yet. I just have the standard on the back which looks pretty good to be fair.

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[MadRhino]

@MadRhino urgh man. That's bad. Lucky it was just that

Not a matter of luck. The MTX39 had been laced on this Cromotor 5 years ago and survived many crashes over 10k miles before I sold the bike to a friend. A good choice of rim and proper lacing job has all the chances to last, even on a fast and powerful bike.

 

[markz]

A good choice of rim and proper lacing job has all the chances to last, even on a fast and powerful bike.

A good rim <-----that just doesnt sound right
Good spokes
Good lacing job

 

[MadRhino]

A good rim <-----that just doesnt sound right

What rim are you talking about?

A good rim is even more important than the lacing job. Look at a wheel hitting hard in slow motion, you will see that any rim does deform, but some are springing back to straight shape without any damage, while others stay crooked, dented or cracked.

 

[markz]

A good rim <-----that just doesnt sound right

What rim are you talking about?

A good rim is even more important than the lacing job. Look at a wheel hitting hard in slow motion, you will see that any rim does deform, but some are springing back to straight shape without any damage, while others stay crooked, dented or cracked.

Sun Rhyno Lite and the XL variant, DM24 Alex that is 32mm wide, fat rims the SAS.

 

[MadRhino]

All crap but the Halo SAS that is not bad for the price in 24’’.

The Sun Ringlé MTX 39 is better than a Chinese motorcycle rim in a crash test, despite being a fraction of the weight. I have a Double Track that suffered so many crashes in a decade, that I stopped counting them 5 years ago.

Ps: buy no rim that is called lite, unless it is a lifetime guarantee carbon rim. :wink:

 

[Hickbeard]

@MadRhino stay away from sugar free rims lol. Words to live by lol

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[Balmorhea]

Ps: buy no rim that is called lite, unless it is a lifetime guarantee carbon rim. :wink:

Sun Rhyno Lite isn't a particularly light rim-- claimed 565g in the 26" diameter. It's one of the stronger options that's easy to find and has braking surfaces.

It's called "Rhyno Lite" because it followed a model called "Rhyno" which weighed over 750g in the 26" size.

 

[MadRhino]

I know. I’ve had them both, and still have some mammoth on the shelves. Never had any luck with the Rhino Lite though. Cracked one, busted the sides of the next, pulled 8 spokes through the last that I was still riding on the front.

Now I like them heavier, and welded.
I have one that has no name, ordered online from Classic Cycles. Very tough, 950g with this profile: seen it before?

 

[Balmorhea]

I have one that has no name, ordered online from Classic Cycles. Very tough, 950g with this profile: seen it before?

I don't recognize that one, but I would use it if I had it available.

 

[MadRhino]

Classic Cycle doesn’t have it in stock now. Their stock is very low for anything. But I will order more of them as soon as they’re back. Their rims are all blinded of any brand names and original numbers. I can’t recall either, who was making this one, so I can’t check elsewhere to find them.