29" rims

Daytripper63 said:

Are all 29" rims the same width? Is the KH29 the same width as the
skinny rim on the Yuni 29er and if they are different what are the
measurements or where can I find the widths...
Thanks
Robert

There aren't any 29" rims. Only 29" tyres. And they all fit on rims
designed for 28" tyres. The 29" tyres are just a little fatter.

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goldenchicken said:

There aren't any 29" rims. Only 29" tyres. And they all fit on rims
designed for 28" tyres. The 29" tyres are just a little fatter.

Strictly speaking this isn't quite true. Modern 28" and 29" rims have
the same tyre bead diameter, which is called 700c, so all 700c/28"/29"
tyres can fit on them.

However, there are 29" specific rims, like the KH and Nimbus rims,
which are significantly wider, like 2 times wider than other 700c rims.
I think Bontrager make one too. Whilst you can fit all tyres on all rim
widths, running a narrow road tyre (like 1 inch or below), on a 29" rim
would be asking for trouble, and running a wide tyre like a big apple
or a muni 29" tyre on a narrow rim isn't nice either. The super-wide KH
rim makes a real big difference to how stable the wide tyre feels,
which is really important on a unicycle, much more so than on a bike,
as you put more sideways forces on it.

I've also got 26x1" slicks on my bike which has some cheap rim designed
for 26x1.75"-2.1" tyres, and it was awfully hard to get the tyres to
seat in the rim, and they look a bit too spread out (seem to work
though).

To answer the original question, if the Yuni rim is what's called the
Nimbus rim in the UK, then it's similarly wide to the KH, but I presume
must be a different rim, as it needs different length spokes according
to the spoke calculator.

Joe

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I realize the 28/29 rim issue, sorry for not being specific enough. What
i have now is a Yuni 29 with a nanoraptor tyre and it often feels like
I could roll it off the rim so I was wondering if the KH29 rim is wider
or does it have the same issue

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Can you fit a schawble big apple 28 x 2.35 on a KH 700c??

I guess yes, is that rigth?

Thanks guys!

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Daytripper63 said:

I realize the 28/29 rim issue, sorry for not being specific enough. What
i have now is a Yuni 29 with a nanoraptor tyre and it often feels like
I could roll it off the rim so I was wondering if the KH29 rim is wider
or does it have the same issue

KH rim is 36mm wide on the outside, 30.8mm on the inside. It looks
super-duper fat compared to most 700c rims.

I think there was an old (narrow) and a new (wide - 36mm outside)
nimbus rim, so it might be worth measuring yours to see how fat it is.

If you've got the fat rim, it might be a tyre pressure issue.
Otherwise, if you've got a narrow rim, a wider rim makes this rolling
thing much less likely.

monociclos - yes you can.

Joe

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joemarshall said:

KH rim is 36mm wide on the outside, 30.8mm on the inside. It looks
super-duper fat compared to most 700c rims.

I think there was an old (narrow) and a new (wide - 36mm outside)
nimbus rim, so it might be worth measuring yours to see how fat it is.

If you've got the fat rim, it might be a tyre pressure issue.
Otherwise, if you've got a narrow rim, a wider rim makes this rolling
thing much less likely.

monociclos - yes you can.

Joe

Thanks My existing rim is a Mavic MA40 and it reads 622x13-6106 on
label any idea how this translates?

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Daytripper63 said:

Thanks My existing rim is a Mavic MA40 and it reads 622x13-6106 on label
any idea how this translates?

MA40's are skinny for a 29er tyre...the kh rims are about twice as
wide....i have 2 of them, pm me if you cant source one and i'll sell
one to you...shipping is expense though since it classified as
"oversized" by UPS

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It has often been discussed here that the Schwalbe Big Apple has a
tendency to steer to the sides of the road (depending on road
conditions, tire pressure, rider abilities).

Has anybody some experience how rim width influences this behaviour?

Juergen

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My 29er rim is a Mavic T224
I use it for muni and also have the problem of tire roll. Are these
rims wide or narrow compaired with the KH?
I think it's a touring bike rim. Whatever that means!

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willdabassist said:

My 29er rim is a Mavic T224
I use it for muni and also have the problem of tire roll. Are these
rims wide or narrow compaired with the KH?
I think it's a touring bike rim. Whatever that means!

Most of the mavic touring rims are something like 23mm outer width. I
think the widest one is 24mm. So the KH rim at 36mm is more than half
as wide again.

I didn't notice the tyre roll happening on the KH rim at all, even with
sidehops and a not too hard tyre. Previously I had to use more pressure
than I liked in order to avoid tyre roll.

Joe

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joemarshall said:

Most of the mavic touring rims are something like 23mm outer width. I
think the widest one is 24mm. So the KH rim at 36mm is more than half
as wide again.

I didn't notice the tyre roll happening on the KH rim at all, even with
sidehops and a not too hard tyre. Previously I had to use more pressure
than I liked in order to avoid tyre roll.

Joe

When i look closer on my rim, it says "28mm" and "37mm" on top of each
other. What would these be refering to? When i meausure it with a ruler
it only comes to about 25mm.

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willdabassist said:

When i look closer on my rim, it says "28mm" and "37mm" on top of each
other. What would these be refering to? When i meausure it with a ruler
it only comes to about 25mm.

Might be a recommended tyre size range. My 26" bike rim I've got here
says 1.75"-2.1" on it, and it came with 1.75" tyres on.

Joe

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joemarshall said:

Might be a recommended tyre size range.

I'm sure that's right. I've got Mavic 224s on my road bike* and they
do recommend minimum 28mm tyres on those.

Rob

* OK, before you say I'm weird running 28mm tyres on a road bike...
It's a fast touring frame built for 32mm tyres that I don't use for
touring anymore, so it's become more of a commuting/Audax bike (so 25mm
would be more normal) - but anything narrower than 28mm looks
ridiculous with the frame clearances.

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