Maxxis Hookworms

Discussion in 'Performance Mods' started by BWB, Dec 24, 2015.

  1. BWB

    BWB New Member

    I read that the prefered tire for racing are the Maxxis Hookworms. So I bought a pair. Now I'm racking my head trying to figure out how to run these 3" wide beasts without chain rub. Or do the racers just let em rub because a race is short enough to not to wear through the tire?

  2. butre

    butre Well-Known Member

    hookworms are 2.5 inches and shouldn't rub too bad. maybe you can dish your wheel towards the pedal side or shim the motor to the left
  3. BWB

    BWB New Member

    My bad they are 2.5 " . I'll have to try shimming the motor cause that's whats screwing up the geometry . The frame is a GT2A with a pedestal front mount. I could cheat that over maybe an 1/8th or so. Not sure how to do the back mount though.
  4. KCvale

    KCvale Motorized Bicycle Vendor

    I stopped in because I thought the 'hookworm' tires were cool but maybe I can help.

    The thing is, once you go wider than ~2.25" tires on a direct drive 2-stroke, the chain won't fit past the tire, and trying to modify your engine mount and rear sprocket is usually an expensive futile effort.

    My basic build rule is if the tires at their widest point is over 2 ΒΌ" you need pedal side drive.
    Your bicycles pedal side always works.

    That is just the price of going with a 2-stroke with fat tires, but to works well.
    A SickBikeParts shift kit has worked well for me anyway.

    Silly to do without bicycle rear wheel gears to take advantage of having geared engine power as a bonus, but doable, and you can always lace a new internal shifting hub into your back wheel.

    These Kenda Flame tires are 2.65" and the chain clears.


    You can go much wider, it just a matter of tying into the pedal drive.
    Last edited: Dec 26, 2015
  5. jaguar

    jaguar Well-Known Member

    extend the rear sprocket outward and mount a metal plate between the chain and the tire so the chain will hit it instead of the tire when it wobbles towards it
  6. lazylightning@mail.r

    lazylightning@mail.r Active Member

    I mounted my engine about a centimer offset from the center of the frame and the left pedal still clears the left side of the engine with about 3-4mm to spare. That will suffice for a 2.5 inch tire, but if you go over 3 inches it may not be enough and a jack shaft of sorts would have to be thought up for the left side moto-chain. If you are running a jack shaft for the right side so you get power to the bicycle chain and gears, then it's just a queation of tuning the dimensions in your jack shaft setup.
  7. BWB

    BWB New Member

    That is good advice. I don't really want to hassle with a jack shaft on this build mainly because I'm running mag wheels that can't switch hubs. I probably should have mentioned that right off the bat. Thank you though KCvale for the knowledge. Good to know if I make changes. And thanks Jaguar I will give that a shot.
  8. tekstep01

    tekstep01 Member

    i have a 1.75 on back and 2.75... with a 1.75 inside of it on the front ... heavy i know.. but no crazy flats at 30 for me....
    Timbone likes this.
  9. MacZulu

    MacZulu Member

    when i first mounted my fat frank 2.35" it rubbed. I loosened all 3 mount points of the engine. my mounts are custom. after the engine was "loose" I jostled around and was able to get out of the rub. then slowly went around tightening the mounts little at a time while watching my chain path.


    the head is maybe 2mm to the left of the frame, no bad vibration. been running probably over 300 miles so far. I am ordering new tires and they are 2", they don't come any wider so I will be running skinny again. well skinnier than I want, I like all the extra comfort I can get
  10. Frankfort MB's

    Frankfort MB's Well-Known Member

    Has anyone ran the cyclops tires? They are 2.4in wide and are a nock off maxxis hookworm basically same tread but only 15$ a tire
  11. KCvale

    KCvale Motorized Bicycle Vendor

    Not heard of Cyclops, got a link?

    I liked them on this full suspension dirt racer...


    ...just not as much as the 3" Kenda Flame tires I have been using lately.


    The rims are 24", but the tire is 26".
    Picture a clown's long balloon for a tube ;-}

    If you look close you can see the tread channels are cut to look like flames, hence their name hehe.


    It's a lot of rubber to the road, the ideal amount for most street riders under a number of weather conditions in my opinion.

    I have built fatter tire bikes too, they are just too fat and out of everything I find 3" to be ideal.

    And yes, those tires and tubes take a lot out of the road, and with a front shock you can take a small speed bump at 25mph and barley feel it.

    Just an FYI of what I am using these days when I can, and why, hope it helps.
    Last edited: Apr 13, 2016
  12. Frankfort MB's

    Frankfort MB's Well-Known Member

  13. Frankfort MB's

    Frankfort MB's Well-Known Member

    That's the link for the cyclops 2.4in tires... Thought about running those for a second build this year
  14. MotorBicycleRacing

    MotorBicycleRacing Well-Known Member

    Socal Motor bicycle Racers like the Cyclops.

    Scotto's 212 cc 20+ HP wins on Cyclops. They last for many races too.

  15. Frankfort MB's

    Frankfort MB's Well-Known Member

    Based off that it makes me think they will hold their weight in the corners lol
  16. KCvale

    KCvale Motorized Bicycle Vendor

    Ya, Scotto has the skills and reflex's to get everything from a bike in a race.
    You rock bud!
  17. Frankfort MB's

    Frankfort MB's Well-Known Member

    Some people get into this kinda stuff lol even though it's still just a bicycle with an engine attached to go really fast ;)
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