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Thread: 29er vs CX bike

  1. #1
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    29er vs CX bike

    Hi there,
    i have been wanting to let go some of my bikes and now after some testing i am selling my CX bike.


    I have just done 2 different rides with data,
    1. along a rough cycle track with some muddy parts, tarmac, and some smooth hard pack canal path. 12 miles.
    Both bikes had WTB Nano's 700 x 40c


    2. All on road, including a 3 mile climb with some very steep parts.
    Both bikes with Vittoria Voyager Hyper's 700 x 35c (37mm wide)


    Both rides were done February in the UK, so very wet and cold.
    I rode at about 70% - 80% of my maximum power, on average, a fast cruise.


    THE BIKES:
    2013 Voodoo Bizango MTB hard tail. 14kg. With the tyres used in the test, the bike weight would be getting close to 13.2kg. Flat pedals. BAR ENDS, Tioga power stud 6.


    2014 Boardman CX Team. 9.6kg. With Shimano MT35 wheel set which is 400g's lighter than the stock Mavic xm319's.
    SPD pedals.




    THE DATA:
    CANAL PATH muddy in places, HARD PACK, KNARLY BUMPY CYCLE TRACK.
    I had the WTB NANO's at 39psi R and 37 psi F.
    A little hard for the conditions, not as much float as i'd like normally, but this gave good speed on the smoother parts.


    CX bike
    1:01:06sec
    12 miles
    ave speed 11.85
    max speed 20.5


    29er
    57:32sec
    12 miles
    ave speed 12.6
    max speed 24
    6% faster






    ROAD RIDE
    The Vittoria Voyager Hypers were at 80psi R/F, as they are 37mm wide, it would be roughly the same as 32mm tyres at 95psi.


    CX bike
    1:31:20sec
    21.7miles
    ave speed 14.25
    max speed 40


    MTB bike
    1:33:40
    21.7 miles
    ave speed13:86
    max speed 38
    2% slower








    WHAT IT FELT LIKE


    CANAL/KNARLY CYCLE TRACK
    Going from the CX to the 29er with its much wider bars and excellent Tioga bar ends, i felt so much more secure, so much more leverage.
    The Suntour SR fork soaked up most of the bumps. And as most of the conditions were (typical British winter conditions) wet, muddy, mossy tarmac surfaces having the extra control inspired confidence to push harder with the 29er.
    I had more fun on the 29er for sure.
    On the CX bike, it was fun too, but with the front end jumping around a bit more, i had to choose my lines more.
    Not surprised at all that the 29er was a lot faster.


    ROAD RIDE
    Over all the CX was a little more comfortable with its various hand positions. But the 29er with bar ends was ok, no problem. Maybe a really long road ride i'd want the CX bike, but i don't like being on roads with cars that much. I did 6 years as a cycle courier, done my time with traffic.
    At 2% slower the 29er is close enough to the CX for me to sell the CX.
    And the CX has lighter wheels, is 3.5kg lighter and has SPD's.
    I think if the 29er had these, the times would be almost identical.




    CONCLUSION:
    I am 50 years old. When i was in my prime as a courier riding all day long 25 years ago i may have got more out of the CX bike at the higher speeds, thats a guess.


    The test has proven to me, what i thought, that with the same tyres and with bar ends to get more aero, a MTB or hybrid can keep up with road style bikes.


    But a CX just can't keep up with a hardtail on rough surfaces.


    And of course the CX would get blown away on proper single track.


    I am now going to sell the CX bike.


    I'm going to have 4 sets of tyres for the Voodoo Bizango.


    3.0 front (rigid fork) and 2.4 rear (the most clearance allows)mtb tyres for mud and mountains.
    Thunder Burts or Panaracer 42mm Gravel kings or 40mm Nano's for gravel.
    2.35 Schwalbe G-one speeds front and rear for hard pack and road. These tyres have the same rolling resistance as fast 25mm road tyres.
    and
    40mm Voyager hypers for tarmac touring.


    I am quite amazed at the Voodoo Bizango. I bought it for £280 on Ebay. Highly recommended.
    Last edited by tablatom; 02-11-2018 at 04:20 PM.

  2. #2
    Formerly of Kent
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    Unless you applied the same power, in the same conditions, the test is meaningless.

    Sent from my XT1585 using Tapatalk
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  3. #3
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    Quote Originally Posted by Le Duke View Post
    Unless you applied the same power, in the same conditions, the test is meaningless.

    Sent from my XT1585 using Tapatalk
    Meaningless to you, not to me.
    Its my experience. I know if i did it again 5 times the results would be very similar.

    Same for most riders.

  4. #4
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    Nice comparison. It makes sense the CX bike would be faster on the road, probably with a more aggressive body position allowing better engagement of leg muscles and slightly more aero than the 29er.

  5. #5
    Formerly of Kent
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    Quote Originally Posted by tablatom View Post
    Meaningless to you, not to me.
    Its my experience. I know if i did it again 5 times the results would be very similar.

    Same for most riders.
    Oh?

    Unless the power for the pedaling sections was the same, atmospheric conditions are probably the main source of the differences.

    Saying you did it at "70 to 80%" of your max power means you a) didn't measure it and b) have no way of actually knowing if that was true.

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  6. #6
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    You wouild have to try this test several times to approach being "scientific" at all.

    You did it once? it sounds like you were looking for an excuse to let go of the cx bike, so there's a bit of bias there. That's fine, ride what makes you happy. Just don't imply that thr comparison was scientific.
    Thorn in your Sidewall
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  7. #7
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    so put drop bars on your niner

  8. #8
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    Sure its not scientific.
    What i can say is, i am a consistent rider. I know about pacing myself.

    And i know that if i did the same 2 rides more times with the same tyres and bikes the times would be close enough for me.
    Close enough to see easily that my thoughts that a mtb is a more versatile beast is correct.
    A little slower on road, and a lot faster off it.

    So, its time to simplify. Fewer bikes with some tyre choices.

  9. #9
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    Might put Jones H bars on it.

    For me Drops don't cut it for road riding.

    I like bar ends.
    What i love about bar ends is going up hill.
    So much leverage.

  10. #10
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    I doubt you needed it to be scientific. You can use some figures to back up your experiences just like everyone does when they 'demo' different bikes. You'll ride the one you enjoy the most.

  11. #11
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    Quote Originally Posted by eb1888 View Post
    I doubt you needed it to be scientific. You can use some figures to back up your experiences just like everyone does when they 'demo' different bikes. You'll ride the one you enjoy the most.
    yes exactly

  12. #12
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    Sometimes it just feels like the right time to jettison some equipment.
    It ain't supposed to be easy.

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  13. #13
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    Quote Originally Posted by life behind bars View Post
    Sometimes it just feels like the right time to jettison some equipment.
    Absolutely.
    i don't need 4 bikes.
    Going down to 2.
    I've been to villages in 3rd world countries where owning a bicycle is like having a car, an expensive car.

  14. #14
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    There are varying levels of scientific experiments, from case studies to double blind randomized trials. This is more like 2 case studies, same rider, same courses, same subjective effort, different bikes on different days...which isn't a bad thing. Not that robust, but arguably still scientific.

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