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I don't understand cyclo-cross bikes

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Comments

  • #62
    billy.fish
    Closed Accounts Posts: 671 ✭✭✭billy.fish


    Wot Morgan said :)

    Sorry should have posted the link, great sessions folks, bring MTB or CX bike its all good.

    Bring on the mud. My new tires just arrived, putting them on as i type...quite dificult actually

    Lumen...dude....rim....cmmon...70PSI = to much


  • #63
    Lumen
    Registered Users, Registered Users 2 Posts: 30,490 ✭✭✭✭Lumen


    billy.fish wrote: »
    Lumen...dude....rim....cmmon...70PSI = to much

    OK, I get that in the mud you want to run 30psi or whatever.

    But what if you're going over hard ground? You'd get a pinch flat on the first big bump. I read an account of last years Three Peaks where they were running big pressures to avoid this.

    Or do Irish CX races always take place on grass and mud?

    Need some cheap tubulars. Or mad skillz.


  • #64
    Caroline_ie
    Registered Users, Registered Users 2 Posts: 5,400 ✭✭✭Caroline_ie


    Lumen wrote: »
    Yeah, but imagine if Blorg had kids? It'd be like Robin Williams' house.
    i don't think they sell these on wiggle.


  • #65
    billy.fish
    Closed Accounts Posts: 671 ✭✭✭billy.fish


    Lumen wrote: »
    OK, I get that in the mud you want to run 30psi or whatever.

    But what if you're going over hard ground? You'd get a pinch flat on the first big bump. I read an account of last years Three Peaks where they were running big pressures to avoid this.

    Or do Irish CX races always take place on grass and mud?

    Need some cheap tubulars. Or mad skillz.
    3 peaks last year i ran 55psi and had spare wheels below each descent, will do the same again this weekend.

    Faster irish courses (st annes, lurgan) i'd run about 40. SLower muddy ones (tymon, corcagh) ~30psi....its what you can get away with.

    If you pinch flat you are probably just taking a bad line :D but seriously skilz do come into it.

    We can play about with pressure tomorrow night!


  • #66
    blorg
    Registered Users, Registered Users 2 Posts: 15,995 ✭✭✭✭blorg


    niceonetom wrote: »
    Looks like a cool bike. I'd really like a bike I could put some big tyres on and I think I'd get more use out of a cross bike than a MTB.
    Don't know why you would think that... A cross bike is quite limited compared to a mountain bike to be honest in terms of the sort of off road you can tackle comfortably. And the braking is horrendous. Ribble have some wide profile cantilevers I am going to give a go. A cross bike is good for cross racing really as far as I can make out... or arguably as a tourer where you might have an off-road component.


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  • #67
    Raam
    Registered Users, Registered Users 2 Posts: 14,318 ✭✭✭✭Raam


    blorg wrote: »
    Don't know why you would think that... A cross bike is quite limited compared to a mountain bike to be honest in terms of the sort of off road you can tackle comfortably. And the braking is horrendous. Ribble have some wide profile cantilevers I am going to give a go. A cross bike is good for cross racing really as far as I can make out... or arguably as a tourer where you might have an off-road component.

    You're buying a new cross bike, aren't you? Don't lie to me, I can tell when you are lying to me.


  • #68
    Lumen
    Registered Users, Registered Users 2 Posts: 30,490 ✭✭✭✭Lumen


    Raam wrote: »
    You're buying a new cross bike, aren't you? Don't lie to me, I can tell when you are lying to me.

    He has three already. I'm trying to convince him to use his Tricross Single. If anyone can do fixie cyclocross, it's Blorg.


  • #69
    blorg
    Registered Users, Registered Users 2 Posts: 15,995 ✭✭✭✭blorg


    Raam wrote: »
    You're buying a new cross bike, aren't you? Don't lie to me, I can tell when you are lying to me.
    I'm going to change the brakes for wide profile cantilevers and use my tourer, the frame is actually sold as a cyclocross bike so it should be suitable.

    AMCX_BK_L_big.jpg

    My Sirrus had major problems with the brakes getting clogged but I will also try Lumen's tip of moving the brake pads out a bit (to be honest the braking on it is bad enough already though.)


  • #70
    ryan_sherlock
    Registered Users, Registered Users 2 Posts: 885 ✭✭✭ryan_sherlock


    Lumen wrote: »
    OK, I get that in the mud you want to run 30psi or whatever.

    But what if you're going over hard ground? You'd get a pinch flat on the first big bump. I read an account of last years Three Peaks where they were running big pressures to avoid this.

    Or do Irish CX races always take place on grass and mud?

    Need some cheap tubulars. Or mad skillz.

    I'll have a pair of tubs but my training wheels will be a pair of clinchers setup (probably) with Stans NoTubes... (http://www.notubes.com/product_info.php/cPath/21_58/products_id/411).

    I run between 22-30 psi on my XC wheels with Stans without an issue. My training wheels are standard, non tubeless, Mavic 717 rims.

    I got away racing with 18psi in my rear tire (2.1 Racing Ralph with NoTubes ZTR wheels) for almost all of my race yesterday in Scotland. It had a LOT of pointy rocks and roots and I didn't have an issue. I was riding such a low preasure as the goup did not properly fix a tiny hole in the sidewall until it reached that preasure. I could have changed wheels but I risked it anyway.


  • #71
    billy.fish
    Closed Accounts Posts: 671 ✭✭✭billy.fish


    Low is good, all about traction you see. Trust me, traction is needed in many CX race in Ireland and Wales...freekin winter mud is just a special thing


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