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Q-Factor Bosch

Discussion in 'Technical & FAQ' started by Sambal Oelek, Jan 11, 2017.

  1.  
    Sambal Oelek

    Sambal Oelek Pedelecer

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    Just curious, what is your q-factor on your Bosch crank?

    I have a fatbike with Performance CX and have about 246mm! Kind of much!? Don't know.

    [​IMG]

    (easy to measure if you measure one side to the centre of the tube, turn the crank and measure other side, add together, should be same on each side I think)
     
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    Sambal Oelek

    Sambal Oelek Pedelecer

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    Ok, I ordered some cranks to try and find a more straight one, but it was difficult...

    First I have to show you the distance between the crank and chainstay. It is about 17mm as you see. That would mean I can easily fit a crank which is more straight, I feel it would not have to be more than maybe 5mm space there.

    Crank distance.jpg

    So I took off my crank and measured the curve, from bottom to inner edge, as on photo. It was about 58mm (on this side (R), the other side was 55mm). (It is branded "Miranda" btw).

    Crank measure.jpg

    Well, the other three cranks was all more straight (and same measure on each side), here is the numbers:

    Haibike Xduro Fatsix original: 58mm (55mm)
    FSA Metropolis CK-632/IS: 26mm
    FSA Metropolis AL-8/IS: 35mm
    FSA 745/IS: 26mm

    Cranks (top).jpg Cranks (side).jpg

    It would have to be like 45mm or something, the AL-8 came closest but still too far away to be used :(

    And, as you might see, my original crank was stucked and I stripped the threads so I had to pull it out with a big tool, so, now I don't have any crank at all).

    So, I'm in deep **** now, anyone have some crank that have about 45mm if you measure like I did there? (or maybe it's easier to measure from top to top or something if it's on the bike).

    /edit: I found one that have 49mm there, see below. Miranda Delta 0.
     
    #2 Sambal Oelek, Mar 5, 2017
    Last edited: Mar 5, 2017
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    soundwave

    soundwave Pedelecer

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    • Informative Informative x 1
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    Sambal Oelek

    Sambal Oelek Pedelecer

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    Soundwave! Thanks for that. I think we found that website simustaneously. I was looking at the back side of my crank and it said "Miranda" so I was looking there...

    It looks like the "Gamma 0" model (looks 99% correct), but couldn't find the right measurements there, but the "Delta 0" model has the EXACT numbers even though it doesn't look the same really.

    Miranda Delta 0 version 55Q-35 (Stock).png

    They have a Q-factor choice for each crank, so I found out that the one named "55Q:29.6" is what I should need here, looks like this:

    Miranda Delta 0 version 55Q-29.6 (Wanted).png

    That gains about 5.5mm on each side. They have one "55Q:21" also but that would be 14mm less and that's too much I think, don't feel like chansing.

    So... they have a store where I ordered the Delta 0 standard black version 175mm/ISIS but you couldn't chose the Q-factor so I added a message to the order and hope they can send me the right one. It costs 60 Euro with shipping 10 Euro. Quite ok I think!

    Really glad I found this! Hope it works.

    Btw. That page was crank heaven!!! If you need a new crank, go there, I'm sure you'll find it.
     
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    Sambal Oelek

    Sambal Oelek Pedelecer

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    Got them now! Serious stuff this.

    Miranda cranks 01 box.jpg Miranda cranks 02 unboxing.jpg

    They look a little cleaner than my old ones, couldn't find them now but here is the new ones:

    Miranda cranks 03 photo.jpg

    And, when measured it is exactly like planned, 49.2mm! How great this is! Now I have all the stuff to get my fatbike in one piece!

    Miranda cranks 04 measure.jpg
     
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    Sambal Oelek

    Sambal Oelek Pedelecer

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    Alright!! Today I mounted the new crank arms, the Q-factor is now reduced with over 2cm. Great!

    P1010085.jpg P1010086.jpg
     

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