Dr. Sludge and other gungy tyres

by kayakboyuk   July 25, 2012  

I gave some Dr. Sludges a try for the commute. Was getting to work late too often. Only a 5km route but broken glass everywhere, yet I can do miles in the country no problems of course. Well I got mixed results. They didn't prevent flats; they would *sometimes* stay up after a repump long enough for me to get where I was going.
The real problem I had was the valve on the tube would gunge up with he green fluid and could not be pumped up anymore. They would slowly loose pressure and need to be chucked out eventually.

Any suggestions for sorting these valves out or would I be better just investing more money in a better pair of tyres.

cheers, G

8 user comments

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No experience of filled tubes but I'd recommend better tyres. I have a similar commute and use scwalbe duranos on my road bike or marathons on my hybrid and while I get a lot of cuts from the glass its rare that I get a p******e.
It doesn't take that much longer to swap out a tube than to pump up a tyre anyway.

TheHatter's picture

posted by TheHatter [811 posts]
25th July 2012 - 14:35


Were you using the can of Dr Sludge to fill the tubes you had in already??


Buy the pre lined tubes Wink

But as said above, I'd be getting (better) puncture resistant tyres

Gkam84's picture

posted by Gkam84 [9039 posts]
25th July 2012 - 16:59


I converted my rear wheel to tubeless - no punctures for the past year. Although at the same time I changed to a Kevlar belted tyre, so I'm unsure what's had the biggest effect, likely that - but if and when it does puncture, the slime inside should get me home.
After years of trusting to tubeless tyres on motorcycles and cars, I saw no reason to distrust them on bicycles, with the same setup.
There was one thing I did find on a motorcycle - a tube with slime in it doesn't seal at all well and only if you're lucky will it allow you to carry on. A tubeless one with slime in will just work.

posted by Cauld Lubter [122 posts]
25th July 2012 - 17:20


You buy them with the green gunge inside them already. It just leaks out when you release any air from the tyre and then sticks up the valve. Surprise

Only good at sitting-down sports

posted by kayakboyuk [41 posts]
25th July 2012 - 18:01


I found if you have the valve at the 10 to 2 or 12 o'clock position the valve seems to stay clear when sticking air in.....the slime moves down the tube... Big Grin
Always seems to block up when the valve is set low.....

colhum1's picture

posted by colhum1 [98 posts]
25th July 2012 - 22:54


Expensive brand name ones I've had nothing but problems with. The Halfords own brand cheapies though, they work very well.

You hear 'pooosh' as you get a puncture, then 'poosh, poosh posh pss pss ps nothng' as it seals up. The secret with sealing tyres though, is DON'T STOP WHEN YOU HEAR A PUNCTURE. You need to keep the wheel rotatting.

posted by localsurfer [169 posts]
27th July 2012 - 18:01


Go for better tyres. Then you don't need to put that stuff inside and the bike will roll much better.

Bontrager Race Lite Hardcase. Good speed for such a resilient tyre and not particularly heavy. My choice for 700c.

Schwalbe Marathon Plus

Specialized Nimbus Armadillo

Simon E's picture

posted by Simon E [2054 posts]
28th July 2012 - 10:56


I've not managed to puncture Gatorskins or Top Kontakts in 10,000 miles of commuting through London. Keep the pressures up.

posted by musicalmarc [60 posts]
29th July 2012 - 21:33