Revelation 426 DualAir (@115mm) on a 100mm corrected frame?

a_harris
a_harris Posts: 41
edited April 2008 in MTB workshop & tech
I have a Kinesis Maxlight XC frame that I'm building up which I gather is corrected for 100mm forks.

I wondered what someone more clued up than me would think about fitting a set of Revelation 426 DualAirs to it that I have set at 115mm?

I know they're more of an All Mountain type fork but they're relatively light and are very adjustable. I think the AC measurement on the RVL is about 508mm but don't really know what the corresponding measurement might be on a 100mm fork (and I'm sure they differ between manufacturers). I also believe I could tweak the negative air chamber to lost a little travel if needed for my frame. Any thoughts on this would be much appreciated!

Cheers, Andrew

Comments

  • nicklouse
    nicklouse Posts: 50,675
    should be ok, the steering may feel a tad sloppy, my 100 recommended bike is odd at 130mm fine at 100 and usable at 120..

    i would be happier with a 100mm reba.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • a_harris
    a_harris Posts: 41
    Many thanks for that. I'm leaning towards trying it and seeing how it feels (as long as the probable slacker angle doesn't put a dangerous amount of stress on the frame/head tube joints?).

    I know the frame and forks aren't an ideal match but I have the Revelations already - if I were buying forks specially I'd go for 100mm,

    I've read stuff about the axle to crown measurement being key to issues like this as well as travel?

    Cheers, Andrew
  • nicklouse
    nicklouse Posts: 50,675
    axle to crown is the main thing, (see the FAQ section) for each inch (25mm) of axle to crown height change the head angle with be changed by 1 degree. so as you can see a 15mm change will about 1/2 a degree.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • skyliner
    skyliner Posts: 613
    If you got the fork as an aftermarket purchase, you should have travel adjust spacers in the box to set it at 100mm. So if it's not quite right, get it dropped.
    It's nice to be important, but it's more important to be nice.
  • nicklouse
    nicklouse Posts: 50,675
    edited April 2008
    iis the 426 dual air All travel?

    goes of to check. it only seems to be 115 or 130,

    Is it tweekable down to 100?
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • skyliner
    skyliner Posts: 613
    edited April 2008
    The all travel spacers set it to 115, my mistake.
    You can drop them a little further by adding more -ve presure.

    The crown to axle will be about the same as a Zocchi fork @100mm though.
    And there's usually a little leeway built in to allow for different manufacterers forks to be used.
    It's nice to be important, but it's more important to be nice.
  • nicklouse
    nicklouse Posts: 50,675
    i bet extra spacers could be used to bring it down to 100 though...
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • skyliner
    skyliner Posts: 613
    It should be possible.
    I can't see it affecting the performance too much.
    It's nice to be important, but it's more important to be nice.
  • smitty
    smitty Posts: 125
    yeah it should be ok ive done the same thing with my kona kikapu and it feels fine
  • a_harris
    a_harris Posts: 41
    Hi, thanks for eveyone's input on this. I decided to build the bike up and see how it felt first of all and took it round the block for the first time last night. I think it's set at 130mm but I did put a bit more pressure in the - ve side as I thought that might help. Actually feels quite 'normal' so far so I'll keep it like this until I've done some more miles inc. off road before I consider getting it changed to 115mm.

    The Revelation feels nice 8)
  • tuxpoo
    tuxpoo Posts: 138
    The Maxlight is listed as 90-120 forks on the Kinesis site ...

    http://www.kinesisbikes.co.uk/product.php?id=4

    Tux
  • a_harris
    a_harris Posts: 41
    Thanks tux, I noticed that but mine is the mk1 (XC) rather than the XC2 so wondered if the geometry may have been tweaked. Have found XC geometry now and pretty much the same so I'm not as far outside of the range as I thought (and will be within it if i get it changed to 115mm).

    Incidentally I took a rough axle to crown measurement on a set of Marzocchi 100mm forks which are on my other bike and the only seems to be about 5-6mm difference. Are Marz A-C's generally longer than RS?
  • skyliner
    skyliner Posts: 613
    Yes. They're generally the longest CTA measurement in the industry. Which is why I kinda thought your RS would be ok with a little extra -ve pressure.
    Don't forget though, if a frame is rated for X amount of travel, it's safe limits are usually 30mm above that. So it shouldn't affect handling too much unless you're used to a particular head angle, and are hypersensitive to changes in that area.
    It's nice to be important, but it's more important to be nice.