Tubs

I tried to order Mastik online but the order was refunded as they said Royal Mail won't handle it because it's a combustible chemical? Anyone else experience this? (went to Condor and bought Conti)

Totally deserved.

When I decided to use it. It was like a solid rubber brick. It was incredibly difficult to separate the tyre, without tearing off the base tape. No one could have managed this on the road side.

I've carried that spare tub, in a state of ingnorant bliss, Down the length of Norway, and over a dozen mountains :S

Not that Ive sold myself as a tub expert here. But I use the conti carbon specific stuff. Its harder to apply, and harder to remove. But does give a solid result once on. I sit the tub in hot water for a while before applying With a toothbrush. Which makes it fume quite a lot. So its an outdoor Activity.

Mastik. Every time.

Also, you don't need to remove all the glue when you change a tyre. Just any loose lumps of it that've formed.

Went for Tubasti cos I'm impatient. Streeeetching time now. Don't think I'm going to use the Pista CL though, it really is indoor use only.

Just ordered some mad'light Schwalbe tub's. Latex + handmade, blurb reckons they are 120g a piece in 700x22. We shall see.

Only really have one set of wheels for the track (which I rarely visit) so they will be for training + pretending to race.

A silk latex Dugast is 145g for a 22mm, really don't see how Schwalbe can shave 25g off that without putting a tread on a latex inner tube.

I've got a couple of Tufo Elite <120g tubs which I use as emergency back-ups. The one I've just weighed came in at 116g. Happily I've never had to use one yet, so I've no idea whether they're as fragile as one would expect a 116g tub to be...

Christ. Surely you've got zero chance of making it home without another puncture on a tub with that minimal construction? That's about 10g more than the conti butyl tube I just weighed.

It's purely subjective, but they feel pretty sturdy. Blokey here claims to have done 200 miles on one, and I've heard anecdotal stories about Peter Reid (some slevless chap apparently) finishing an Ironman on one.

They are rated for indoor track use only, which is where they are going.

At that weight yeah I can imagine its just a slither of latex with smear of rubber on it, they are rated upto 205psi and I'd intend running them in the 170-180psi bracket. No idea what they are made of but they are going cheap enough that its worth finding out. If they ride OK and don't immediately explode I might order some more.

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I'd intend running them in the 170-180psi bracket

Crazy fool!

I know I know, I should go the full 200psi

Rumour has it when a tyre carrying >200psi bursts it breaks the sound barrier

Arrived today,uber light yes, 700c? Barely. Tightest tub I've ever attempted to stretch onto a rim. Will leave them for a few days to stretch up. Smell nice though and 122g on my scales (in their poly bag)

150psi was always plenty for Conti 22mm Sprinters when I was about 80kg and racing.

mmmm acetone, glue and fresh rubber filling my flat today.

Couldn't find anyone selling tape in town so just started glueing instead. Theres also a thread on retrobike claiming you loose about 0.0013% of overall power by using tape vs. glue.

Think my glue is duff, sets in seconds which makes trying to true the tub an utter mission. Also the base tape is a bit narrower than the rim meaning you dont get the luxury of tell tales for quick alignment. Got one pretty good, but the other, reset and start again I think. Paper thin side walls don't help either, easily the hardest tub i've fitted before (only done maybe 12-15), hands are wrecked!

Tape will do in some cases.>

Never. Banned from most, if not all, tracks. Evil.

But I use the conti carbon specific stuff. Its harder to apply, and harder to remove. But does give a solid result once on.

No need. The standard Conti mastik works fine and dandy for carbon. Add a little bit of Patex and its good to go.

@umop3pisdn didn't mention track use.

Theres also a thread on retrobike claiming you loose about 0.0013% of overall power by using tape vs. glue.

Rolling resistance is tied to the amount that the tyre can squirm on the rim. Using tape is the worst of all worlds. For the absolute minimum rolling resistance one should use a sold mastic such as shellac or an industrial glue such as TEROKAL 2444.

@umop3pisdn didn't mention track use.

This is a track forum. But that aside... Once one learns how to cement tape is harder to use than mastic, messier than mastic, less reliable than mastic and provides worse rolling than mastic.. Why use tape? A tape that is strong enough not to pose a safety problem will be quite difficult to use and nearly impossible to remove from a rim.

Yup, glue is bad, without a huge amount of effort can peel the tub back off the rim. Problem seems to be its adhesion to the rim surface (totally clean with decent acetone), its just bobbling off.
Did the usual 2 thin thin coats over 24 hours on the rim, then 1 more generous coat and immediately fit tub (which has also had 2 thin coats at least 24hrs before).

Zefal Pastali = shite for Mavic CD rims.

did you rough up the rim surface? might be too smooth for your glue.

Neg. But never have had to before. Most rims have been standard silver ano, this one is CD coated, been used before and old glue was an utter mother to get off.

Will do some emery wet 2000 grit on it, buy better glue, drink beer, try again.

Or maybe beer should come first?