I've finally got my ancient wheels out and got some new tubs -
I've followed the gluing process here after scraping off most of the old glue.
However they are just not sticking with any strength, I can pull them off easily (after 24hrs of drying!) - I've now tried twice with no luck.
The tubs are Tufo Primus, rims Mavic MA40, glue continental
Any tips? They might be getting sold at this rate!
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I reckon veryone has their own little methods so here goes with mine that may sound daft to others, but hope it helps.
I usually do a layer on rim/tub and leave over night. Then another layer on rim/tub about 12 hours later, and another the day after. Finally i do a layer on both rims (doing 2 at a time is easier), then a layer on the first tub (by which time the rim layer has dried a tiny bit) then proceed to curse heavily while mounting the tub. After regaining composure and normal colour to skin do the second tub. With 2 sticky layers only just spread they bind together really well and not difficult to get in line. Perhaps leave 2 days to dry to really give it chance to settle properly. Many thin layers is best, and dont worry about leaving strictly 24 hours between layers etc in my opinion. I often to a layer in the morning, then one at night about 12 hours later, then another the next morning, it has dried in that time.
Never had a problem when using Tufo and Continental rim cement doing it this way. More important to use many thin layers with new Tufo tubs as their base tape on the tub soaks up the first layer in no time. Only issue I have ever had is when using continental carbon specific rim cement on some carbon wheels which was awful and held about as well as blue-tac.
For what it worth here is my 'belt and braces' method. It takes best part of a week to complete but I haven't lost a tub using this method (fingers crossed). I did roll a tub 2 weeks ago but that was a glue only method.
1. Pre-stretch tub, it saves loads of swearing later. Put tub on rim and inflate for min 24 hrs.
2. Apply glue to both tub and rim. Leave 24hrs.
3. Apply another layer of glue to both tub and rim, this is usually a thinner layer. Leave 24hrs.
4. Apply Tufo extreme tub tape to rim. Make sure tub tape is well pressed onto rim.
5. Apply thin layer of glue to tub and allow to dry to tacky about 1 hr.
6. Stick tub on rim and pull out tub tape paper strip.
7. Inflate to 40psi and ride on rollers.
In your particular case, Tom, it might be worth cleaning the surface of the old glue - something like isopropyl alcohol is good as it doesn't leave a greasy residue, and it can soften the glue that's already on the rim giving a better bond. If there's lots of glue already on the rim, consider sanding it with coarse grit sandpaper before you clean.
I always found that the nasty residue left by Tufo extreme is more hassle than the tape is worth - according to tufo it's designed to cope with the extra heat generated by long descents on the road (think Tour de France), so perhaps it's designed with heat stability in mind more than grip at normal cross temperatures (i.e. close to zero!).
For what it's worth, i use the method described here: http://www.embrocationmagazine.com/online/how-to-gluing-cx-tubulars , and "i've never had a problem"! The only time a tub i've stuck has rolled was when my other half used my wheels in a wet race, and the tubs were stuck on with Tufo extreme! Like Mark rightly says, everyone has their favourite method, and as long as you check your tubs can't be peeled off easily, it's very unlikely you'll die. Best of luck with it.
Great - thanks for all the advice
I think maybe I need some tape as the tubs are not sticking in the centre of the rim
I've just followed that Embrocation method - I take it that's usual tub tape (eg Jantex) you put on, so it's a glue/tape combo.
It's kinda hard to get the tyres on completely clean, since you're removing the backing from the tape and it's also got extra glue on, but all seems good so far. Not that I've ridden them yet...
Another layer of glue on both tubs and rims - its stuck a bit better but not well enough - aaargh!
The rim shape and tub shape just don't seem to match and therefore the tub is only sticking on the outside of the rim