Tire/Rim slip

[ALLMTB]

Good day fellow Hubbers

 

First of all let me introduce myself as I am brand new to The Hub SA.

 

I am an MTBer from the northern suburbs of JHB in my twenties. Not too sure in what category of MTB I can place my self but I prefer aggressive XC, Trail and a bit of All Mountain riding.

I look forward to hearing from other Hubbers.

 

At the moment I am struggling with a silly problem but it is the cause of a lot of frustration and I need some help please.

My front tire seems to slip on the rim, not so much that you can notice it while braking but enough to pull the tube along with it, pulling the valve stem skew, and eventually causing the valve to tear out of the tube. I don’t run my tires soft at all. ( I have gone through 4 tubes already in a little more than month! Aaaaarrgh! )

 

What I have tried:

 

- Removed the old rim tape, cleaned all the dust out of the rim, replaced with new rim tape.

- Cleaned the inside of the rim lip properly to remove any dust, grime or dirt that might cause the tire to slip.

- Got upset, swore a bit and eventually tried to glue the tire to the rim with rubber cement.

- Suspecting that the tire was faulty I swapped my tires back to front but still the same problem occurs especially with the front tire.

 

Tire/ wheel set up:

Front - DT Swiss 445D with Conti Moutainking 2.4 foldable non UST.

Rear - DT Swiss 445D with Conti Gravity 2.3 foldable non UST.

 

I have read that sanding the inside of the rim lip with fine sandpaper might help...don’t really want to do that.

Is my last resort to go tubeless?

 

Please help!!!

[LOOK695]

Come on you MTB's, this man wants to enjoy his riding. Help him out

[Pusher]

What pressure do you pump your tyres to?

[patches]

Welcome to the Hub!

 

A few questions concerning your problem.

 

What rims are they?

What tyres (brand, model and size)?

What tubes (particularly size)?

 

and as Pusher asked, what pressure you're runing your tyres at.

 

Oh and your 4 tubes in 1 month... what kind of punctures? Thorns, pinch-flats (snake bites), front wheel, back wheel?

 

And non-topic related... where do you mostly ride? (me and my riding mates are also northern suburbs JHB. Dirt jumping, DH and aggressive-but-dun trail riding... and all are welcome)

[ALLMTB]

Thanx Patches!

 

I mentioned most of your questions on my original post.

But here is as again:

 

My front tire seems to slip on the rim, not so much that you can notice it while braking but enough to pull the tube along with it, pulling the valve stem skew, and eventually causing the valve to tear out of the tube. I don’t run my tires soft at all. ( I have gone through 4 tubes already in a little more than month! Aaaaarrgh! )

 

Tire/ wheel set up:

Front - DT Swiss 445D with Conti Moutainking 2.4 foldable non UST.

Rear - DT Swiss 445D with Conti Gravity 2.3 foldable non UST.

 

To answer Pushers' question, its hard to tell what exact pressure I am running as I don't have a pump with a gauge.

But let me put it like this. I run my tires hard enough so that they do not deform or fold over when I sit on the bike with my full weight ( 76kg ) when the tire ( stationary ) is on the edge of a brick or similar object for example. I hope that makes sense...

 

Non topic: I ride mostly at the MTN park as I stay a few blocks away, others areas include Kings Kloof, Teak ( think it closed down ) , Northern Farm and the Spruit. I don't really know of any other places to ride, just recently got back in to MTB. Thanx again Patches!

[KevinRhino]

Hi

 

I was having the same issue, firstly it was with my back tyre and then my front.

 

Before I had the issue, the 1 thing that I did change to my normal tyre/tube setup - was adding tyre liners (Ryder).

 

What seemed to be happening was sand, grass and other very fine materials were getting into the tyre/tube/lining and mixed with the powder from the tubes, it seemed to make the tube, tyre and liner very slippery - and in 1 day I had 4 tube's values getting pulled from the tube.

 

My solution:

============

1) I had the Schrader - thick black valve initially with the bike - so I decided to change to Presta - thin steel valve (with steel nut inside rim and normal one on the outside of the value

2) Clean the inner tyre with water & cloth

3) Clean the tyre liner with water & cloth

4) Add a bit of syrup in between the tyre/tube and liner

 

I have not had the same issue re-occur - done about 300km since with various types of terrain.

 

Good luck - I know this is not the most elegant - but has worked for me so far - but will be upgrading to tubeless in the near future.

[Just Keep Pedaling]

This should never happen. There is something wrong with one of the components. Either you have the wrong tubes, tires or rims. Since you have replaced the tubes a few times I am going to say the tires are probabbly wrong. Not all tires are the same size. On my bike I have the opposite problem - tires I can't get onto the rim because they are too small. Your's might be the opposite problem.

 

Edit: When I say not all tyres are the same size I mean not all 26" tyres are the same size - they differ from brand to brand and even tyre to tyre.

Edited September 6, 2011 by Just Keep Pedaling

[Just Keep Pedaling]

Maybe try the syrup method. At least if it doesn't work you can make some pancakes and cheer yourself up

[Pusher]

One thing I find that's invaluable in my cycling kit is a good foot pump with a decent gauge. You will be surprised at what pressure you think you are pumping your tyres to to the actual pressure. I often change my pressure to the type of riding I do and with a foot pump it's quick and easy. I also do road and pumping my tyres to 110PSi by hand is a joke!

[ALLMTB]

Thank you all for your replies.

 

Think I will try Kevin Rhino's method with the syrup. Dont really care if it is elegant ( if i wanted elegant I would do ballet, he he he )

 

The different sizes for differant makes and models is very valid point. Perhaps I should try another make of tire.

Could it also be that the rim is not compatible with the tires? A buddy of mine has the exact same tire setup as I do but he runs them on Shimano XT rims and does not suffer with this problem al all. Mmmmmmm....

[patches]

Thanx Patches!

 

I mentioned most of your questions on my original post.

But here is as again:

 

My front tire seems to slip on the rim, not so much that you can notice it while braking but enough to pull the tube along with it, pulling the valve stem skew, and eventually causing the valve to tear out of the tube. I don’t run my tires soft at all. ( I have gone through 4 tubes already in a little more than month! Aaaaarrgh! )

 

Tire/ wheel set up:

Front - DT Swiss 445D with Conti Moutainking 2.4 foldable non UST.

Rear - DT Swiss 445D with Conti Gravity 2.3 foldable non UST.

 

To answer Pushers' question, its hard to tell what exact pressure I am running as I don't have a pump with a gauge.

But let me put it like this. I run my tires hard enough so that they do not deform or fold over when I sit on the bike with my full weight ( 76kg ) when the tire ( stationary ) is on the edge of a brick or similar object for example. I hope that makes sense...

 

Non topic: I ride mostly at the MTN park as I stay a few blocks away, others areas include Kings Kloof, Teak ( think it closed down ) , Northern Farm and the Spruit. I don't really know of any other places to ride, just recently got back in to MTB. Thanx again Patches!

 

 

My bad, I missed that part in your original post where you mentioned rim and tyres.

 

WHat tubes do you run? I ask because you're using tyres on the larger side of the scale. I have been told that a 1.95 - 2.125 (standard MTB) tube will be able to inflate enough to keep a 2.3 tyre happy. I run 2.35" tyres on my jump bike and 2.5" on my DH bike, and just to be safe I run tubes that can inflate to the same diameter as the tyre (if not more).

 

For example

 

2.4 - 2.7" DH tubes for the DH bike (and for the rear wheel of my jump bike)

and a 1.7 - 2.5" Conti tube for the front of the jump bike.

 

On occasion when I have used a standard 1.95 - 2.125 on the 2.35" tyres, I notice that they sit a little loose. Maybe this loose could be what is causing your slipping issues?!

[Big H*]

Rim slip is serious problem with heavy plant and machinery. A method to measure this is to mark the tyre in relation to the rim and after a few rides to measure and see the extent of the slip.

[ALLMTB]

My bad, I missed that part in your original post where you mentioned rim and tyres.

 

WHat tubes do you run? I ask because you're using tyres on the larger side of the scale. I have been told that a 1.95 - 2.125 (standard MTB) tube will be able to inflate enough to keep a 2.3 tyre happy. I run 2.35" tyres on my jump bike and 2.5" on my DH bike, and just to be safe I run tubes that can inflate to the same diameter as the tyre (if not more).

 

For example

 

2.4 - 2.7" DH tubes for the DH bike (and for the rear wheel of my jump bike)

and a 1.7 - 2.5" Conti tube for the front of the jump bike.

 

On occasion when I have used a standard 1.95 - 2.125 on the 2.35" tyres, I notice that they sit a little loose. Maybe this loose could be what is causing your slipping issues?!

 

 

Good point.

I run normal MTB tubes, Kenda, think they are 1.9 to 2.2. Where can I find a larger size DH tube? Are they much heavier that normal sized tubes?

[patches]

Good point.

I run normal MTB tubes, Kenda, think they are 1.9 to 2.2. Where can I find a larger size DH tube? Are they much heavier that normal sized tubes?

 

Mike's Bikes has DH and FR tubes, and yes, they are heavier and cost a fair bit more... but you don't have to go that route.

 

Continental makes a tube that is very versatile.

 

It's just a Continental MTB 26"

They cost between R50 and R60 depending on where you buy them.

They rated for 1.75" to 2.5"

Pretty light weight. Just make sure the rear is inflated well to avoid snakebite.

And even the Schrader version (which I prefer) has the little valve lock ring that Presta's have.

 

This is what they look like:

 

http://www.chainreactioncycles.com/Images/Models/Original/18901.jpg

 

I have bought them from the following stores so you should find them there:

 

Cycle Lab Fourways

Fritz Pienaar Paulshof

Linden Cycles

 

So yeah, give them a try... and hope it helps

[ALLMTB]

Awesome, thank you!

Will give them a try!