How big is an XXL Trek Procaliber?

aprdunn
aprdunn Posts: 6
in MTB general
Help! I need to know whether I can fit the bike I am about to pick up in the UK in my bike box. I’m in Egypt and need to know whether to come back with my bike box, or rely on the cardboard one from the shop. I’d prefer to use my bike box.

The crucial measurement is a straight line from the headset to the derailleur hanger. It seems to be the only measurement not on the spec sheets!

Can anyone tell me this measurement on a XXL Trek Procaliber 9.6?
Thanks.

Comments

  • singleton
    singleton Posts: 2,523
    edited May 2021
    I don't have a frame, so sorry I can't help with a real measurement.
    If someone does have a frame then they can obviously provide it.

    However, in case no-one else replies, can you not use the measurements that you do have and some mathematics (Pythagoras) to find the measurements that you don't have?

    measurements from here:
    https://www.trekbikes.com/gb/en_GB/bikes/mountain-bikes/cross-country-mountain-bikes/procaliber/procaliber-9-6/p/33260/?colorCode=grey_black

    What you know:
    Reach = 50cm
    Chain stay = 43.2cm
    So rear axle to head tube is 93.2cm horizontally (worst case, likely a bit under as the chainstay is not horizontal)
    Stack is 62.3cm

    So the diagonal line from the rear axle (where chain stay is measured from) to head tube (where stack and reach is measured) you can get by using Pythagoras theorum:

    On a right angle triangle, the square of the hypotenuse is equal to the sum of the squares of the other sides

    Square root of ( ( 93.2 * 93.2 ) + ( 62.3 * 62.3 ) ).
    or 112.1cm.
  • whyamihere
    whyamihere Posts: 7,715
    Are you planning to take the fork out? If not, surely the critical dimension is from the rear axle to the front axle as that's the longest part. That's in the geometry chart as wheelbase, but as that's measured from the centre of the rear axle to the centre of the front axle, you'll want to add a few centimetres. The chart has the wheelbase as 119.4cm, so I'd estimate you'd need around 122-125cm.
  • aprdunn
    aprdunn Posts: 6
    Got to take the forks off, see here https://www.bikeboxalan.com/packing-a-bike/?v=79cba1185463

    And the critical distance is definitely headset to hanger

  • aprdunn
    aprdunn Posts: 6
    @singleton thank you, that all makes sense. My old maths teacher will be disappointed I don’t have you’re clarity of thought. As you say, the chainstay is below horizontal, so the projected measurement will err a little on the safe (longer) side.

    Thanks again,

    A
  • mully79
    mully79 Posts: 904
    Just measured my large Trek fuel. 116cm axle to axle and 116cm rear axle to furthest point on headset so despite the maths i'd go with whyamihere. 112cm sounds a bit short.
  • aprdunn
    aprdunn Posts: 6
    @mully79 I am going to take the forks off, so @whyamihere ’s advice doesn’t really apply.
  • mully79
    mully79 Posts: 904
    Im just saying that the measurement from my rear axle to headset is the same as axle to axle so if i take my forks off its 116cm and my bikes two sizes smaller and runs smaller wheels.
  • aprdunn
    aprdunn Posts: 6

    @mully79 I’ve just had a look at the Fuel geometry (nice bike) and the angles are a bit different, and it’s FS not HT, so that might make a difference to the wheelbase. I imagine the wheelbase might be a bit shorter on the HT. Have I looked at the right geometry for your bike?
  • aprdunn
    aprdunn Posts: 6
    Sigma Sports have just managed to measure the bike itself ....... 115 cm! Thanks for everyone’s advice. @mully79 I think you were right, but @singleton I think you were right too, but we just forgot about the width of the head stem (distances on the diagram measured to centreline).

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