What speed do u cruize at on open road?

Discussion in 'Motorized Bicycle General Discussion' started by cyclepro101, Aug 20, 2009.

  1. Junster

    Junster New Member

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    Zoom 80 HT Slanthead, Shift kit running 10 tooth, Expansion Chamber, Custom Intake, K&N, Stock carb. Shimano DT Deore rear hub. Servas Survivors City Drifters, inverse tread, 26" 60psi rear. 50 psi front. Good brakes, Duel pull lever. I run the road up to 40mph at the speed limit right in the traffic. Can do over 40 only with a strong tail wind but I weigh about 220 and I'm 6'4". Helmet & Eye protection always.
     
  2. frascati

    frascati New Member

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    Oh, sorry...yeah.
    ... and helmet and eye protection by all means!

    ahem
     
  3. Earthman

    Earthman New Member

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    What worries me is most drivers drive too close to the car in front. This restricts their view. If they would back off to a safe distance, they’d be able to see what’s happening ahead of them. Since they don’t, you can’t count on being seen. In fact, if such a driver drifts over to the right a foot or two, that’s where you will be on your bike. See attached illustration.
     

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    #23 Earthman, Aug 22, 2009
    Last edited: Aug 23, 2009
  4. Nashville Kat

    Nashville Kat Active Member

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    I gotta get a speedo soon or have somebody follow in a car-

    with a 36t (I've got a 32 coming to try) and now also a 27 X 1/14 wheel on the front, and a 1.75 smooth tread cruiser wheel still on the back, my 66 must be getting up to about 40 if I push- But I'm just guessing.

    But that's really faster than I want to go! I raced USCF for a number of years and know too well what going down on pavement is like- now at 55 years, I don't want to find out again-

    So for me- the goal is to get a good decent cruise of 25- 30 mph without opening up the motor much- those last whining revs never seem to make that much difference.

    I'm going to be almost entirely on the flat, on short trips of several miles (I still don't trust the reliability). Every time I've gone to a thinner tire, it's made a big difference (from 2.25 down to 1.75, and now a front of 1 1/4" width, and i may still change the back one too (But spending too much time fiddling with this- I got to play some guitar too!)

    The vibration really came down once the beach cruiser knobbys were gone.

    the 1 1/4 tires are as thin as I'll go- I think one inch too narrow- you need SOME rubber on the rim in case of blowout- (and I raced always on sew-ups)- and for traction- cause with the motor and the fuel- the bikes more top heavy and NOT as responsive-

    The bigger wheel runs smoother over small ruts, but a big rock can be trouble, and I'm DEFINITELY not going to fly through any corners at any speed. The thinner tires make for a much easier and more natural pedal approaching the road bike standard I'm used to.

    And I'm goning to be staying on the road- most people may want to stay with 26" wheels- unless they want to get real efficiency, and be careful otherwise.

    I ALWAYS wear a helmet with the motor- one has literally saved my life in racing.

    And when I put the big wheel on the front- I also put on a Campy road brake- What a difference over the cruiser cantilever- it really adds some safety.
     
    #24 Nashville Kat, Aug 23, 2009
    Last edited: Aug 23, 2009
  5. floridaboy

    floridaboy New Member

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    I like to ride anywere from 20 to 25 mph. I think that is all the faster i would like to eat payment.
     
  6. cyclepro101

    cyclepro101 New Member

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    I used to race USCF too. I am the same, I just like running the 36t and not flogging the motor too much. 40km/h is fast enough. I can squirt mine to 60km/h but there is no need IMO.
     
  7. Earthman

    Earthman New Member

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    I wouldn't trust the strength of a bicycle frame at the speeds some folks mention here and elsewhere. A bicycle's joints and frame members weren't designed to carry the loads or absorb the impact forces that such loads and speeds create going over even small bumps. The longer and faster you ride, and the more bumps you go over, the faster the frame will fail from fatigue if nothing else. The frame only has so many loading cycles in it, and I doubt anyone can tell you how long a frame will last under your particular riding conditions. My MB tops out at 24 MPH (about 40 KPH) on the flat with a tailwind, and that speed is quite thrilling knowing the above. I suggest that if you need speed, move onto something that was designed for it. No disrespect intended, but everyone will be better off if you do.
     
    #27 Earthman, Aug 24, 2009
    Last edited: Aug 25, 2009
  8. cyclepro101

    cyclepro101 New Member

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    Agree. I think there comes a point where these things stop being motorized PUSH bikes and become full on motorbikes. I find 35 to 40 km/s more than fast enough., and I have a high quality mountain bike too, with hydro disk brakes and oversize Alu frame and I still get very nervous over these speeds, and I have raced bikes on the road for years too.

    Steve
     
    #28 cyclepro101, Aug 24, 2009
    Last edited: Aug 24, 2009
  9. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    Well said fo'sho'!
     
  10. 5-7HEAVEN

    5-7HEAVEN Well-Known Member

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    Did you know that your engine's rpm at 40mph will be over 13,500rpm? Which engine are you using?

    I also have friction drive, 1.375" roller and a 5hp GP460 engine. The bike has enough spunk to shoot past 50mph. 45mph(72kph)at over 12,400rpm is the fastest I've gone, with more throttle left.

    That's on flat ground with no tailwind. xct2

    On a crowded highway 35mph is very comfortable. That's with taking the whole lane.

    I trust the integrity of my nearly new Giant mountain bike. It's not going to fold up like an accordion on the streets. If the bike was made to handle mountain trails, it'll easily handle paved roads.
     
    #30 5-7HEAVEN, Aug 26, 2009
    Last edited: Aug 26, 2009
  11. bandito

    bandito New Member

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    5-7 I dont have a speedo but by judging other cars and with the speed limit at 40 a few times that I tried WOT I was able to keep up with them, the motor is a honda gx50 with 26 in wheels.
     
    #31 bandito, Aug 26, 2009
    Last edited: Aug 26, 2009
  12. 5-7HEAVEN

    5-7HEAVEN Well-Known Member

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    Honda GX50? That's a GREAT engine!

    Methinks your engine would come alive with a 1.375" roller.dance1

    Get yourself a $20 Cateye speedometer. You'll feel proud of your bike's performance.
     
    #32 5-7HEAVEN, Aug 26, 2009
    Last edited: Aug 26, 2009

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