can you increase rear travel????

rustybug69
rustybug69 Posts: 120
edited March 2010 in MTB workshop & tech
i have a 2007 voodoo canzo which runs an rs mc3.3 shock for 4 inches of travel with 130mm rs revelations up front. later 2008 on canzo's have 5 inches of rear travel using a rs monarch shock.what effect would replacing the rear shock with the later model have(geomtry etc?) and is it viable as i have the chance of a cheap later model shock!

Comments

  • nicklouse
    nicklouse Posts: 50,673
    both those shocks can be the same size.

    totally different back end.

    not happening.

    2007-Voodoo-Canzo-detail.jpg


    CanzoDay3-3.jpg
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • ilovedirt
    ilovedirt Posts: 5,798
    Some people fit longer rear shocks to their bikes, which does increase rear travel, it also completely messes up the geometry and looks totally ridiculous. You want more travel? Get a new frame.
    Production Privee Shan

    B'Twin Triban 5
  • rustybug69
    rustybug69 Posts: 120
    nicklouse - can always rely on you for a super speedy response!!! my canzo is the mystic blue 26" which visually has an identical linkage/frame to the 2008/09/10 models although there may be subtle differences in rocker length(???). i think the canzo's in your pics may be the 2006 and 29er frames.
  • supersonic
    supersonic Posts: 82,708
    We are talking that just a few mm here o than can have a big difference. These rockers and leverages are very precisely designed to work with a certain shock.
  • rustybug69
    rustybug69 Posts: 120
    ilovedirt wrote:
    Some people fit longer rear shocks to their bikes, which does increase rear travel, it also completely messes up the geometry and looks totally ridiculous. You want more travel? Get a new frame.

    what effect on geometry would a 1" increase have - slacken head/seat angles???? no probs with current frame just wondered what it would be like with matched front and rear travel.
  • nicklouse
    nicklouse Posts: 50,673
    rustybug69
    lets see you bike then.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • ilovedirt
    ilovedirt Posts: 5,798
    rustybug69 wrote:
    ilovedirt wrote:
    Some people fit longer rear shocks to their bikes, which does increase rear travel, it also completely messes up the geometry and looks totally ridiculous. You want more travel? Get a new frame.

    what effect on geometry would a 1" increase have - slacken head/seat angles???? no probs with current frame just wondered what it would be like with matched front and rear travel.
    steeper head angle, higher bottom bracket so not as stable through the corners, not to mention the fact that the frame just wasn't designed for a longer shock than is already on there, so amongst other things, you more than likely won't be covered by any sort of warranty should you choose to fit a longer shock.
    Production Privee Shan

    B'Twin Triban 5
  • rustybug69
    rustybug69 Posts: 120
    nicklouse wrote:
    rustybug69
    lets see you bike then.



    http://zoke2.0catch.com/CanzoBuild003.jpg

    easier to find a link to a pic rather than try to get pics off my camera!! maybe expert eyes can see differences between frames?

    http://www.adrenalinebikes.com/Images/D ... anzo26.gif
  • nicklouse
    nicklouse Posts: 50,673
    what is the spec of your shock?

    i2i and stroke.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • nicklouse
    nicklouse Posts: 50,673
    rustybug69 wrote:
    nicklouse wrote:
    rustybug69
    lets see you bike then.



    http://zoke2.0catch.com/CanzoBuild003.jpg

    easier to find a link to a pic rather than try to get pics off my camera!! maybe expert eyes can see differences between frames?

    http://www.adrenalinebikes.com/Images/D ... anzo26.gif

    totally different linkages in those two.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • nicklouse
    nicklouse Posts: 50,673
    pics of your rear end of the swing arm.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • rustybug69
    rustybug69 Posts: 120
    nicklouse wrote:
    pics of your rear end of the swing arm.

    will post pic's tomorrow - are you determined just to prove me wrong or do you like me struggle to see any differences!! i know that just bolting on a longer shock is not the done thing but from pics other than subtle differences in cable runs etc the rear swing arm and linkage look the same. This all started with me buying an unused/unknown history old stock frame from halfords after reading review of 2010 canzo. thought all mystic blue frames were same but it turns out the 2007 was 4 not 5" - as usual guy in store didn't even know what model frame was. it rides really well and built up with full xt,big brakes and xm719 rims only goes 27lb. cost to date is £130 as all components swapped from hardtail.
  • benpinnick
    benpinnick Posts: 4,148
    You wont know until you try. I run a shock 5 mm too long and 5mm too much stroke on my full suss and I am 100% certain that it has improved the suspension (being a much better shock) steepened the head angle to compensate for the longer forks I fitted (are your's original - they seem long for a 100mm travel rear?), raised the BB - its a specialized etc. I also got 13 mm more travel to boot.

    I would suggest that you post your shock length and strokes, and we can advise on what shocks would fit. Clearly you cant just throw anything on their or you risk not using all the stroke, or blowing through it too quick! But in principle a sensible new length shock should potentially be ok.

    Ben
    A Flock of Birds
    + some other bikes.
  • rustybug69
    rustybug69 Posts: 120
    shock is a 190 x 50 mc 3.3. bought as frame and shock only but original fitted forks would have been 85-130mm u-turn recons so assumin g my 130 mm revs will just give me a slacker head angle.
  • supersonic
    supersonic Posts: 82,708
    rustybug69 wrote:
    nicklouse wrote:
    pics of your rear end of the swing arm.

    will post pic's tomorrow - are you determined just to prove me wrong or do you like me struggle to see any differences!! i know that just bolting on a longer shock is not the done thing but from pics other than subtle differences in cable runs etc the rear swing arm and linkage look the same. This all started with me buying an unused/unknown history old stock frame from halfords after reading review of 2010 canzo. thought all mystic blue frames were same but it turns out the 2007 was 4 not 5" - as usual guy in store didn't even know what model frame was. it rides really well and built up with full xt,big brakes and xm719 rims only goes 27lb. cost to date is £130 as all components swapped from hardtail.

    As I said, we are talking just a few mm can make a big difference! You need to measure the linkage plates to see if they are same, not just look at them. if the 2007 and 2008 have the same geo for the shock, ie 190/50, then the linkages have to be different. Or it maybe that they have simply plugged a different shock in there.

    Or perhaps contact voodoo.
  • benpinnick
    benpinnick Posts: 4,148
    As your on a 190x50 shock, there would be no point moving to a 200x50, so I guess your thinking 200x57 or 216x63 or the really big one (who's size I cant remember)? What are you looking at?
    A Flock of Birds
    + some other bikes.
  • rustybug69
    rustybug69 Posts: 120
    benpinnick wrote:
    As your on a 190x50 shock, there would be no point moving to a 200x50, so I guess your thinking 200x57 or 216x63 or the really big one (who's size I cant remember)? What are you looking at?

    what travel would the 200x57 give me if a 190x50 gives 100mm?surely the smaller increase in eye to eye the less dramatic effect on geometry?
  • supersonic
    supersonic Posts: 82,708
    You need to work out the leverage ratio of the suspension to find out. Given an average 1:3, then you'd get about 20mm more travel. The 10mm eye to eye change will lift the bottom bracket about 30mm in height and steepen the angles by about a degree.
  • The Big Cheese
    The Big Cheese Posts: 8,650
    2574934750ba543c9106.jpg