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Any indication on the impact of such a high pressure inner chamber on rims not specifically designed around the system, Schwalbe suggest in excess of 80psi which is above what many rims are rated for. What you running Michael?
The info from LB on the max pressure is unclear as it gives both 40 & 70 psi. http://www.light-bicycle.com/35mm-wide-29er-rims-beadless-for-bicycle-trail-or-mountain-bike-enduro-with-tubeless-compatibility.html#.VPxPJcseLqA
£150 is pretty pricey, though I just realised I was about to drop £100 on a Bonty Flash Charger pump that would be unnecessary with this, so I'm 2/3 towards the cost already
I suppose though that since the procore's self-contained, it may not apply pressure on the rim in the same way as a tube does...
Must admit, I agree with moley on this - foam insert would be a much easier way to achieve largely the same thing. I even tried to make one once but gave up when my double-sided tape turned out to be perished
The psi limits on rims relate to outwards force on the bead - the ProCore inner tube/tyre isn't generating this kind of force. If you were to use ProCore on a narrower rim than it's designed for then you could run into problems.
Must admit, I agree with moley on this - foam insert would be a much easier way to achieve largely the same thing. I even tried to make one once but gave up when my double-sided tape turned out to be perished
I'm going to go out on a limb and say a foam insert that had the density and cross sectional area required would be heavier than the procore system. Don't forget that the system is intended to make the spring rate of the tyre more progressive as well, so that it interacts with the suspension better.
Pumping up two chambers per tyre can't be considered much more work than one, surely? I'll bet that for most rim/tyre combos it will actually be easier to setup than normal tubeless since the inner tube/tyre will secure the bead of the outer tyre and thus eliminating any potential problems with getting it to seat.
The major problem I saw with foam was allowing the tyre bead down into the rim "well" when mounting - I tried to see if I could wangle it but this was the point that the tape wasn't really up to it. It may be that this is the deal-breaker with foam; I don't think the weight would be significant really
... and progressivityness is a "meh" from me (then again, when I first heard about procore I assumed it'd be a much bigger inner, running at 30+ with a small volume of low-pressure air around it so what do I know ?)
Mine have a hook, but no lip. Newer ones have a lip, but no hook.
What? 😕
Foam would be compressed by the air pressure in the tyre though. Even 'only' 20psi is 2.5 times atmospheric pressure (think on it before you reply, armchair physicist) and the foam will get compressed down to nothing quite quickly.
Unless you allow the tyre pressure to permeate the foam but that would bring its own problems. Essentially, air is quite good for this job. It's why our tyres are filled with air, not foam.
nick - hook is on the inside edge at the top of the sidewall and stops the bead coming off the top of the sidewall, lip is on the bed of the rim and stops the bead dropping into the well in the centre of the rim.
At least that seems to be how he's using the terms.
The psi limits on rims relate to outwards force on the bead - the ProCore inner tube/tyre isn't generating this kind of force.
I thought one of the purposes of the inner was to put pressure on the tyre bead to keep it seated to the rim, so you still have high pressure on the rim, albeit indirectly.
For this reason I don't see a foam solution working as it would do nothing to put pressure on the bead.
nick - hook is on the inside edge at the top of the sidewall and stops the bead coming off the top of the sidewall, lip is on the bed of the rim and stops the bead dropping into the well in the centre of the rim.
Correct. I didn't think it was so hard to understand...
I asked LB if I could run Procore on their 38 mm rims and they said fine, although there answer also said their rims are rated to 75 psi which is below the max quoted by Schwalbe.
I thought one of the purposes of the inner was to put pressure on the tyre bead to keep it seated to the rim, so you still have high pressure on the rim, albeit indirectly.
Pressure on the bead doesn't matter - it's the force that matters. A big carcass pulls outwards much harder than a small one because force = pressure x area. The ProCore inner is tiny and the rim loading is mostly radial, whilst a tyre pulls on the rim tangentially with the sum of all the force pushing out on the tyre.
I was running 5.5 - 6 bar, 80-85 psi on MX W40 and W35mm Syntace rims. 2.35 Schwalbe Magic Mary.
Foam core would not work. If you used closed cell then it would compress. If you used open cell then you can't use latex.
I hope to have a set here in the UK soon and happy for people to try them on the demo Liteville bikes I have. Not got dates yet. I couldn't bring the development ones back to the UK for obvious reasons.
Interesting thread.
We shall see. As with all this stuff, if it was GBP20 to try, most of us would. I can see that GBP150-ish is a fairly significant outlay for something that isn't necessary and may not even be desirable.
NextDayTyres told me "mid-March" but couldn't guarantee it.
🙂
Will these work on my 45 mm rims?
Anyone know, or work out, what you'd do in the case of a flat outer tyre. In the case of a race run I get the benefits of the inner core staying up so you can continue on your run at a decent pace. But if you are just out on a day riding with your mates and you puncture the outer tyre, how easy is it to get a tube in there to allow you to finish your days riding. If I was in the middle of a big ride, I wouldn't fancy going a considerable distance only using the inner core.
Suppose you'd have to remove the procore. And then get a Professional Schwalbe Approved Technician with a HNC in Procore Installation and CORGI registration to put it back in
I guess you'd hope to be able to use an anchovy thing. A bigger slash could be a hassle though (probably procore out and tube in).
lol @ Northwind.
In reality, I reckon you wouldn't be fixing it in that way.
Most punctures would be handled by either the latex, or one of those 'dog turd'/anchovy bung solutions
If it was a big tear, you'd have to strip it all out and patch it, before putting a tube in. Of course, Shwalbe keep saying you can use lightweight tyres, but then tears would be more common. I'd just stick to Maxxis EXO probably which I'm yet to tear in 5 years.
Surly thee is a ghetto version?!?
Yes there is!
[url= http://www.bikeradar.com/forums/viewtopic.php?f=10004&t=12981525 ]Ghetto ProCore[/url]
And then get a Professional Schwalbe Approved Technician with a HNC in Procore Installation and CORGI registration to put it back in
Do they make them in a size that fits in a Camelback, or ideally a rear jersey pocket as I don't often ride with a Camelback anymore.
<awaits first person who accidentally punctures the procore while trying to fit an anchovy>
<awaits first person who accidentally punctures the procore while trying to fit an anchovy>
This hadn't occurred to me as a problem. But now you mention it....
🙂