Any question answered...

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  • Hoosier do lots of tyres for speedway and drags. Not sure about this. I reckon just painted on.

    urbanvelo.org/ground-up-polo-bike­-at-nahbs-2013/

  • Basic bike mechanics. Pretty embarassed to ask TBH. But I'm going nuts.

    Installed a new Veloflex Master 23, on a well used (but never braked on) cxp33, with veloplugs, on the back of my fixed.

    First time with a latex inner. Got it to 80 PSI, then after 5mins the inner blow out the side. Figured it was installation error.

    Second time with a new latex inner. Got it to 60 PSI, all well. The next day I topped it up, and it went bang again in the process.

    Last night I chucked the spare butyl inner from my saddle bag, and gave it 50 PSI. Came down this morning and it hard blown over night.

    Pretty sure the veloplugs are installed tightly, although they where ripped out when I looked this morning. So it has to be a faulty brand new tyre, or a faulty old rim. If I get hold of a new inner I may re-install the tyre, moved 90 degrees around the rim, and see where it blows.

    Which is most likely at fault here? Brand new Veloflex, or used cxp33 with pristene sidewalls?

    PS.
    fucketyfucketyfuckety!

  • ground up have made some prettyawesome bikes in their time
    the fixedgeargallery annual winner from 2008 or so was a great rat track
    beefy aero raw metal full of win

  • did you talc the inner tube before insertion? they are notorious for pinching when being installed, talcum powder can help with this

    otherwise it sounds like there is a sharp bit, have all the tubes burst at the same point?

  • did you talc the inner tube before insertion? they are notorious for pinching when being installed, talcum powder can help with this

    otherwise it sounds like there is a sharp bit, have all the tubes burst at the same point?

    Cant feel any sharpe bits. I use latex inners for all my skinny tyre needs, so I'm pretty good at installing them usually. I'm going to mark the point tonight, but I'm pretty sure its the same spot. Actually stood watching the bead separate, and the tube slowly start spilling out, before releasing the air. So its definately something to do with the tyre/rim interface.

    FFS!

  • On new rims, tyre explodey business if often down to a bit of weld that hasn't been machined out of the inside, just under the bead.

    I can imagine a very small bit of weld, or even just road gunk, might have been lurking there for a long time waiting for a sensitive tyre.

  • On new rims, tyre explodey business if often down to a bit of weld that hasn't been machined out of the inside, just under the bead.
    I can imagine a very small bit of weld, or even just road gunk, might have been lurking there for a long time waiting for a sensitive tyre.

    Definitly appears to be something like this. The rims have been fine for a few years. Plus the tyres are brand new.

    I'll check tonight. Cheers.

  • ...Actually stood watching the bead separate, and the tube slowly start spilling out...

    Sounds like the bead isn't seated properly on the rim and/or the tube is trapped under the tyre.

    Can't imagine how else the tube could lift the tyre otherwise. Possibly the new tyres have a little kink from storage.. You definitely need to be noting where they blow each time.

    I know you know and do this, but i) put a little air in the tube before fitting the tyre; ii) halfway through inflating the tyre go around the rim and squeeze both sides of the tyre twixt thumb and forefinger to free it from the rim and ensure it is properly seated; iii) compare some constant detail around the tyre with the rim to visually confirm it is evenly seated.

  • Definitly appears to be something like this. The rims have been fine for a few years. Plus the tyres are brand new.

    I'll check tonight. Cheers.

    Check the tyres really carefully too, even if they're brand new blowing them off can fuck the bead.

  • Sounds like the bead isn't seated properly on the rim and/or the tube is trapped under the tyre.
    .

    thought this may have been the cause of blow-out number two. As I left one side of the bead fitted, chucked in a totally flat inner, and pressed in the remaning bead. Bad technique. But I was looking after the kids at the same time.

    Check the tyres really carefully too, even if they're brand new blowing them off can fuck the bead.

    Nothing visible. But the bead isnt at prominant as I'd like maybe.

    Going to have one last attempt at this. Checking everything. Marking rim, and reversing the tyre (which will mean switching my sprocket over, as I'm anal about these things).

    Cheers folks

  • can anyone point me in the direction of some theories or equations behind the formation of belly button fluff
    I think I have a theory but want some corroboration
    Start here.

  • I'm looking for some chain ring bolts that have each side as an allen key rather then one side allan key and the other flat head... Can any one help out?

  • Basic bike mechanics. Pretty embarassed to ask TBH. But I'm going nuts.

    Installed a new Veloflex Master 23, on a well used (but never braked on) cxp33, with veloplugs, on the back of my fixed.

    First time with a latex inner. Got it to 80 PSI, then after 5mins the inner blow out the side. Figured it was installation error.

    Second time with a new latex inner. Got it to 60 PSI, all well. The next day I topped it up, and it went bang again in the process.

    Last night I chucked the spare butyl inner from my saddle bag, and gave it 50 PSI. Came down this morning and it hard blown over night.

    Pretty sure the veloplugs are installed tightly, although they where ripped out when I looked this morning. So it has to be a faulty brand new tyre, or a faulty old rim. If I get hold of a new inner I may re-install the tyre, moved 90 degrees around the rim, and see where it blows.

    Which is most likely at fault here? Brand new Veloflex, or used cxp33 with pristene sidewalls?

    PS.
    fucketyfucketyfuckety!

    On the inner tube, where abouts is the hole?

  • does anybody know where I might get hold of replacement cups for a 10 speed campag record cartridge bb?

    like this one...thebikefactory.co.uk/productd­etails.asp?productid=41417

  • TruVativ Steel Chainring Bolt Set: Amazon.co.uk: Sports & Outdoors

    This is news to me, never thought to look for something like this.

  • ^^ You can find the spare part reference from here and then Google that.

  • On the inner tube, where abouts is the hole?

    I have three with massive tears in. Probably centered around the NDS bead area (although thats tricky to see), about 140 degrees away from the valve. I think its the same spot each time. But I'm not sure as it only the third time it happened that I realised this. The wheel is still on the bike as I found it this morning. So I'll look at the area again.

    Trouble is I mounted the tyre at the exact same spot each time to line up tyre logos with the valve.

    If its the rim thats warped or has a damaged bead lock. Then I'm upgrading to XR200s and droping 80g per rim.

  • so all the holes are in the same place on the rim? Are they facing down to the rim or sideways to the bead? What shape is the hole?

  • ^^ You can find the spare part reference from here and then Google that.

    cheers, thanks for that. as I suspected, not so easy to get hold of!

  • I keep imagining gruesome injuries happening to my hands and fingers. What's wrong with me?

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Any question answered...

Posted by Avatar for carson @carson

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