Removing glued tubs.....PITA!!!!

Skinner2k3

Either I am very good at glueing tubs or very bad at removing them.....

Conti tubs, conti original glue on clean carbon rim. 3 thin coats, 24 hours apart and a thin coat on the base tape.

I removed the tyre at the weekend in ideal conditions, clean, dry, not mid ride etc and I cannot believe how hard they were to get off. Took a good 20 minutes, wrecked thumbs. Had it been mid ride, cold, wet etc I don't think I could have shifted them.

My question is, is that normal?

In comparison the other tyre was taped (Velox) and was almost worrying easy to remove.

mamba80

well, without opening a tin of worms, if you used conti carbon glue it does not specify the gluing method you used and neither does Vittoria with mastik.
I ve never used tape, or the method you have used but have never had a problem getting a tub off, maybe use a tire lever to get started but that's about it.

sloppyschleckonds

Same as above

StillGoing

3 coats! 1 coat of Conti glue leaving a 4 inch gap opposite the valve hole. 1 coat on the tub and leave to dry. Never had any indications of the tub not adhering to the rim. Had a blow out on a wet and windy ride the other day (pothole hidden under the surface water covered in cow shit from a farm entrance that tore a hole in the side wall) and the tyre came off with little struggle. Pre-glued Tufo tub that'd been wrapped up in the saddle bag for months went on and stuck solid. Again came off easy enough to replace the tub and put the Tufo back in the bag. You don't need all that glue.

sloppyschleckonds

philthy3 wrote:

You don't need all that glue.

Skinner2k3

Not wishing to open any cans. Just want to avoid having that battle mid ride. Tyre levers were used.

Less glue next time then.

Before I glued them I read loads of guides, watched too many youtube vids etc. Didn't think I got the process wrong??? A coat on the rim, one on the tyre, another on the rim, then a final coat on the rim and apply tyre immediately.

On the plus side the Velox tape did clean off really easily with some alcohol so I am back to a clean rim.

Best get some more glue. Now Vittoria Mastik or Conti Original.....will try Mastik One I think.

jordan_217

I've used Mastik one with Conti Sprinters and Competition tubs using the same method as you to fit - they came off ok, after initially having to use a tyre lever to get the first few inches off the rim.

racingcondor

OP - I use a similar method of gluing to you and don't have any problems. I am on an Alu rim though with standard Conti cement so that may make a slight difference.

Interestingly the Conti guide to mounting tubs is different for standard and carbon rim cement with more layers on the Alu rim.

Alu - layers and layers on both
http://www.conti-online.com/www/download/bicycle_de_en/service_en/downloads/download/alurimcement_en.pdf

Carbon - 1 layer on both rim and tyre plus 1 on the tyre when you mount
http://www.conti-online.com/www/download/bicycle_de_en/service_en/downloads/download/carbonrimcement_en.pdf

Diamant49

My understanding is that 3 layers is all that is needed - 1 layer each on rim and tyre, each layer is bonding to the substrate if you like - allow these to dry (doesn't take long). Then one layer on rim or tyre (I put it on the rim) and fit the tub before this layer drys - this layer bonds the two layers of clue together. Anything more is superfluous, I think - works for me anyway.

Obviously when you change a tub the fresh layer of glue goes onto a couple of layers of older glue - but I would usually clean the rim (with Evostick glue remover - on Aluminium) after a couple of changes or if the glue on the rim gets lumpy/patchy.

There is a lot of mystic about tubs, but its pretty simple IMHO!

Oh, I always have used Vittoria Mastick 1 and only on aluminium rims.

Iamnot Wiggins

Just wait until you need to remove the glue from the wheel - then you'll realise what a pain the bum that is!

herzog

Iamnot Wiggins wrote:

Just wait until you need to remove the glue from the wheel - then you'll realise what a pain the bum that is!

Citrus-based cleaning fluid works a treat.

mamba80

there are a lot of scare stories about the amount of glue needed....
When I first started using tubs in the 80s, I d puncture, pull of the old tub, put on a old pre glued one and carry on .... without a care in the world, sometimes not bothering to replace the fitted spare for a few rides, it never occurred to me it "could" roll, as I there was no internet to scare the pants off me

Petrol is pretty good at glue removal !!!

gazman428

For the last few years ive just taped mine on. I carry some spare tape with my spare tubs

keith57

I use Tufo tape on carbon rims. Works well for me. I now leave a gap opposite the valve (on the other side of the rim) to make getting the old tub off a lot easier. Often I'll cut the old tub at this point and I can pull it off easily. Any Tufo tape left on the rim can be pulled off without too much trouble, leaving you with a very clean rim, but still a bit tacky, ready for a new one.

I still pre-stretch the new tub on an old rim for a day or so, makes fitting a lot easier. Getting a new tub on the old rim so it can stretch is the hardest part of the whole process.

Aligning the new tub on the rim is simple as the Tufo tape has a backing strip which makes this easy. Once aligned you add a few psi and pull out the backing strip if you're happy with how it looks. The new tyre can be ridden straight away as the glue sets with pressure, not time.

pippi_langsamer-2

Skinner2k3 wrote:

Not wishing to open any cans. Just want to avoid having that battle mid ride. Tyre levers were used.

Less glue next time then.

Before I glued them I read loads of guides, watched too many youtube vids etc. Didn't think I got the process wrong??? A coat on the rim, one on the tyre, another on the rim, then a final coat on the rim and apply tyre immediately.

On the plus side the Velox tape did clean off really easily with some alcohol so I am back to a clean rim.

Best get some more glue. Now Vittoria Mastik or Conti Original.....will try Mastik One I think.

Hang on a minute- whats the Velox tape for? Youre not putting rim tape on the rim as well are you?

Skinner2k3

I have Mastik One on order which claims to be good for carbon and ally rims, will use one cured layer on each surface and a wet layer on the rim to fit.

At least I have some confidence in the strength of the glue now!

Ref the tape. When fitting the tyres I ran out of glue and time to fit the rear with a TT coming up, so I had no choice but to tape it. Hence one glued one taped, but glad I had the chance to compare the two for strength now.

Iamnot Wiggins

Velox do make tub tape - usually shows at Jantex on the box though.

Skinner2k3

Yeah Jantex by Velox.

And I did remove all the old glue off both rims before I started....yes it's a massive ball ache!

pippi_langsamer-2

Ok, geddit...

DavidJB

Would you rather it was really easy to pull the tyre off ?

Skinner2k3

Of course not, has to be an optimum though.