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I'm re-fitting some tub tyres (1 new, 1 puncture repaired)
Do the rims / tyres need to have all the residue removed? I've read conflicting reports on how important it is to remove all the previous glue.
Im planning on using glue, but they were previously fitted with tape, and its a right ******* to remove - so far the most effective method I've found is applying heat (carefully!) and scraping off. Rims are CF.
CHeers,
Solvent just seems to smear the glue around, I just peel it off by working in small sections. I don't know how necessary it is to remove the old stuff, but I don't want to fit a nice tub and feel a bump every revolution where it's built up, so off it comes.
I tried tape on a recommendation but probably won't bother with it again. It wasn't even appreciably easier than using glue.
I use tape myself. Usual procedure is;
Remove old tub
Stretch new tub by standing on it and pulling gently but firmly.
Apply tape to freshly stretched tub
Ease onto rim
Inflate a wee bit to check tyre seated correctly
Remove remaining waxed paper
Inflate tyre
Ride
All in all it shouldnt need to take any longer than it would ato change a clincher.
Petrol should remove the old residue pretty well. Peel the tape off first then you should just have a bit of sticky residue from the tape to remove it. Or the Effeto Mariposa glue remover is supposed to work well - haven't used it but their Carogna tape is excellent.
I tried tape on a recommendation but probably won't bother with it again. It wasn't even appreciably easier than using glue.
Odd, I've found tape is by far the easiest way to mount a tub, maybe not as satisfying but definitely easier. Get's around a number of sins, including making tight fitting tubs much easier to get onto the rim in the first instance and then getting it straight.
This all assumes you're using Tufo tape, which is double sided. You mount the tape to the rim, leaving the top layer covered. You mount the tub on that (so it slips on easily), get the tub nice and straight, then you remove the top cover from under the tub. Job done. It's a different question when it comes to removing them though. The tub tends to have its base tape rip off when you remove the delaminated layer and it leaves a lot of residue on the rime.
On the original question though, you don't to have a spotless rim, some residue isn't going to be a problem. On a carbon rim, I find it easy to rub it off. I've just peeled the blister off my thumb today from the last one I fitted a week or so ago.
Not sure if you're familiar with the new Conti glue for carbon rims but it's a lot simpler to use. One layer on the rim, one on the tub, leave for 24 hours then a second on the tub and straight onto the rim. No need for second coats on the rim etc (in fact doing this means it won't work funnily enough).
Don't worry too much bout getting all of the old glue off, just get the big bits off & anything that isn't clean.
I then put a fresh layer or two on the rim to make sure it's level & even (layers 24 hours apart) then mount the tyre within 5 mins of the final layer.
That's how I've done my CX tubs for the last couple of years anyway, you won't need to go as extreme with the gluing for road.
Good point GT, tape always on the rim. Not sure what scruff is doing putting it on the tyre, never heard of that.
Tape goes in the bin.
Get all the tape off or you have lumps. The sticky stuff doesn't matter.
I'm a fan of glue as its easier to get the tub straight without fighting scraps of paper. More to the point, when you get a puncture you will find that half the tape comes off with the tubs and half stays on the rim. Thus you have an uneven surface that's only got half stick. With glue the rim always stays sticky and as the best spare is an old one with some glue left on it, it goes on rather nicely.
Tapes has been fine for general use, but for hard cornering (road racing and track) I'd go with three layers of glue. They guy who rolled his tub in front of me a week ago at Cyclopark will have had some stern words with the shop who mounted his tubs.
Yeah, I'm very much a 'glue only' guy historically, but I urge you to check out the Carogna tape - I am very impressed so far. Sticks at least as well as a good glue job and so much easier to use.
http://www.effettomariposa.eu/en/products/carogna-family/carogna/
I'm a glue only man, bar CX tubs where I use the Belgian method of tape and glue. Don't think I could bring myself to trust tape only on anything but a TT bike.
I would go with 2 layers of glue on rims, 2 on tyres, one extra layer on rim for fitting.
Yeah, I'm very much a 'glue only' guy historically, but I urge you to check out the Carogna tape - I am very impressed so far. Sticks at least as well as a good glue job and so much easier to use.
I've been hearing a lot of good things about the Carogna tape as well. Not managed to get hold of any yet though.
I've got a big roll of it here GT.... Got a couple more wheels to do myself but could spare a bit.