Is Top Speed THAT important?

Discussion in 'Performance Mods' started by rustycase, Jun 2, 2011.

  1. rustycase

    rustycase Banned

    Participation in the Top Speed thread seems to be largest on the board...

    I'm new to the china MB's.
    I'd like to know what's REALLY best, all around, so I can build mine right.

    Is Top Speed THAT important?

    My question is, What configuration HANDLES best ?
    ..and of course, which braking setup works best?

    Thanks to all

  2. Al.Fisherman

    Al.Fisherman Active Member

    My bike can probably hit 30+. But I hardly push it faster then 20. If something goes wrong I'd like to stop before I hit the pavement. These old bones and thin skin doesn't heal as well as when I was 30. Speed means NOTHING to me...maybe years ago yea. I'm not in ANY HURRY to get anywhere, If I am then I'll take mu truck. Other then loading my bike in the truck (to climb Oak Mountain).. I stay within 10 miles. Town is 5 miles, and the three other towns close are within the 10 mile range.
    Last edited: Jun 2, 2011
  3. Happy Valley

    Happy Valley Active Member

    That's kind of a loaded question, regardless of the opinion of others the thing to ask is how important is it to yourself?
    Last edited: Jun 2, 2011
  4. 5-7HEAVEN

    5-7HEAVEN Guest

    Personally, I am afraid to see what my top speed would be.

    I've had my bike up to 43 mph in a 35 mph zone. Then I start worrying about getting a speeding ticket. If stopped by a policeman, that would bring me and my MB under scrutiny, legality, etc.

    So top speed is not important to me. I avoid 45 mph speed zones, because cars are travelling up to 55 mph there. Since I always claim the lane, I'd be a sitting duck in the middle of the road.

    Enough low-end torque to climb the steep ramps at my workplace garage is very important to me. I start from a complete stop at the bottom of the ramp. Since I'm using a shift kit, pedalling is nowhere as helpful as with friction drive or ancilliary sprockets.

    Quickness/acceleration and low end/midrange power means EVERYTHING to me. First and second gear ratio is critical for me to distance myself with the impatient drivers behind me. I claim the road, so I need to be out there quickly.

    Yesterday, I was at a traffic intersection stop on a hill, sandwiched between two city buses. The bus driver behind me gave me a honk, but I ignored him. I KNEW he thought I was a slowpoke bicyclist, and wanted me to pull onto the sidewalk. When the light turned green, I let him know why I am entitled to claim the lane. I put several hundred yards of space between that bus and me. He caught up to me at the traffic intersection on the next hill, and I zoomed away.:devilish:

    My next build is Project 29er. It will have twin 4.2 hp GP460 engines, rack-mounted and running through a NuVinci hub. It will have BRUTAL acceleration. Top speed will probably be 55 mph, but there's no way in **** that I will push that bike to its speed limit.

    Well, maybe up to 50 mph in a 45 mph zone.:devilish:
    Last edited by a moderator: Jun 2, 2011
  5. tone2crazy

    tone2crazy Member

    that sounds crazy fast, i was working on a twin 460 goped, but i gave up the sprot b4 it got finished. i was planning on an engine on the side of the wheel and one on top, with chain/gears on both sides of the wheel.

    sounds like a crazy, adrenaline pumping project.
  6. tone2crazy

    tone2crazy Member

    an rc, im sure the more you ride your bike, the less of a rush you get at top speed. which is why alot of people are so concerned with more top speed. plus the bragging rights. imo
  7. Happy Valley

    Happy Valley Active Member

    Heh, I get a chuckle out of the that. When I ride with my bud on his 50cc Yamaha Zuma scooter I guess he's got bragging rights cause he's always leaving me in the dust, lol.
  8. 5-7HEAVEN

    5-7HEAVEN Guest

    I built a twin-engine cruiser bike. It ran two 2.2hp Mitsubishi engines with ADA S1 pipes. Top speed was only 39 mph, but acceleration, especially uphill, was excellent.

    Quickness, not speed, is what I need.

    I'll also need to solve the weight distribution on Project 29er. It'll be very heavy at the rear and light up front. :ack2:
  9. 5-7HEAVEN

    5-7HEAVEN Guest

    To keep things in perspective, I keep repeating three words when riding at 60kph(37.5mph)..."This is crazy, this is crazy, this is crazy".

    At 48-56kph(30-35mph), I say..."This is okay, this is okay, this is okay".

    Nearing home, on the last two blocks, I cruise between 24-32kph(15-20mph)in the bike lane and say "This ride is over... this ride is over... this ride is over".:bowdown:
  10. Big Red

    Big Red Active Member

    Top speed.

    tone2crazy is right about it some of it being bragging rights. MY OPINION, A solid build is MUCH more important than speed. Most of my bikes can hit 35 or 40mph. (depending on gear ratio, tire size,ect.) The speed limit in California for M.B's is 30mph, So anything over that is rarely used,(by me) anyway. I just feel that if ya wanna do 60mph, get a motorcycle.
    Big Red.
  11. Neon

    Neon Member

    What handles the best? Usually frame mounted engines are usually the best as the weight is in the center of the bike, but a properly setup rack mount works well too. As far as brakes go, use whatever you think is best, or can afford, as long as you don't have just coaster brakes.
  12. jaguar

    jaguar Well-Known Member

    Use front and rear brakes in case one or the other fails.
  13. honestly top speed is some what important for me. but only because i am the type that likes to have that speed there, but not have to use it. just because it makes the engine run at lower rpm's and take off better. thats how i like cars too. i like fast cars, but i rarely ever go over 70. i just like to know i could, if i wanted/needed too.

    My bike is a walmart cruiser. i have an sd stinger 66cc on it. it has stock NT carb. (although i am playing around with the dellorto jets). i have a k&n style air filter. i use 25:1 with Lucas semi synthetic oil. i use an NGK b6hs plug and magnecore wire (from pirate cycles). i also have a hub adaptor and 40 tooth sprocket (also from pirate cycles). i also use the teflon coated cluth cable. i was so happy after i put it on because it makes the clutch sooo easy to grip and release. very smooth! it almost feels spring loaded. i recomend EVERYONE GET ONE! its seriously like night and day. i have about 60-70 miles on the bike now. so its not even broken in yet. and i havent pushed it super hard. but with wide open throttle for about 1 1/2 city block. i can get to about 28-30 mph. i weigh 250 pounds. and i bet the bike weighs close to 45-50 pounds. so with the bike not even broken in, and pushing around 300 pounds. i would say thats pretty good without any major upgrades. i find that on my bike the perfect cruising speed is about 22mph. it feels safe, and the engine is at half throttle and an exceptable rpm.

    i recently put a slant pk 80 head on and also a billet intake. i noticed the engine reved much better and when reved it will return to idle very fast. it also sounds MUCH stronger. but when i took it for a ride it didnt seem any faster. and it might actually even be a tad slower. i think i have to mess with the needle setting and jet size again. but for now my bike is out of comision because i stripped all 4 head studs in the engine. i fixed them all with heli-coils. but when putting it back together i broke the bottom piston ring. i have a new set in the mail, and i also ordered a new engine. a grubee skyhawk 66cc. so when i get that stuff i plan on having some more fun. what i really would like these engine to be able to do though, is take off from a dead stop without having to peddle. maybe with a 62 or 66 tooth sprocket you might be able to, im not sure. but i bet with those big sprockets your top speed would be like 15mph. so maybe a shift kit is the way to go. can you take off from a stop with engine only using a shift kit??

    also about brakes. my bike only has a coaster brake. and it actually stops me pretty fast. especially after i bought a new rim, after my old walmart rim died on me. the bearing keepers all ripped apart. so i bought a new rear rim from a bike shop for $54 and put it on. it has a shimano brake, or maybe the whole rim is shimano..? im not sure how that all goes. but let me tell you! with that new rim and brake on there the first time i went to slow down i almost crashed. because i didnt expect the brake to stop me THAT fast. i have no fear what so ever with just a coaster brake. especially the one i have on there now. although i suppose a front brake would be a good idea. i dont think its neccesary...

    CAUTION! one last word. to anyone who is new to this, as i was. be very careful when tightening EVERYTHING on these kits. everything on the kit is very cheap and you will strip it without even trying. i have stripped out almost every hole, bolt and stud on this kit. thankfully i have been able to fix what i have messed up. heli-coils are a god send! jb weld... not so much. i first tried to jb weld the holes, but they pulled right out. so i would say just go straight for the heli-coil! it works great if you are careful drilling the holes. basically the rule is. stop tightening way before you think you should. and just use lock tite to make sure it stays put. also dont use a 3/8 ratchet for anything. 1/4 will do just fine! it would also be a good idea to just replace the hardware with decent quality stuff from the get go. but if not, plan on having to do it later...
    Last edited: Jun 3, 2011
  14. WolfByu

    WolfByu Member

    I had my uncle follow me in my truck and clock me last weekend. I got up to 28 mph and it still had more to give. All I could think at the time tho was my face was gonna get re-arranged by the pavement. So to me top speed isnt important. Getting to ride another day is my priority lol.
  15. Esteban

    Esteban Active Member

    High speed means nothing to me. I consider myself to be riding a modified bicycle, NOT a motorcycle. If I wanted speed, I would get the latter.
  16. 5-7HEAVEN

    5-7HEAVEN Guest

    So you think coaster brake is good enough, huh?

    What are you gonna do if your chain breaks going downhill at 30 mph?

    Or when a car pulls in front of you and your coaster brake locks up?

    Top speed is important to you, but brakes aren't?
  17. motorpsycho

    motorpsycho Active Member

    I'm happy that one of my bikes will hit 30 mph and the other one will hit 35 mph, but i rarely ride them at those speeds.
    my usual speed while riding around is probably 15-20 mph or less, so the motor isn't revving too high all the time.
    yes i have taken both of my bikes up to their top speeds and it is fun, but both of my bikes are 20" frames with 20" wheels. one has a coaster brake and the other has a caliper brake.
    sure the coaster brake works good enough for me, and so does the caliper brake.
    but if i had to stop quickly going 30+ mph on either bike, it would never happen.
    20-30 mph on a bicycle feels pretty fast when you're the one riding it.
    Last edited: Jun 4, 2011
  18. motorpsycho

    motorpsycho Active Member

    ummm, if you are using tghe motor to power the bike why would your crank chain break?
    unless you are referring to the crank chain breaking while trying to apply the coaster brake at 30mph.
    you bring up a good point that i never thought about when it comes to coaster brakes.
    if the crank chain breaks when you apply the coaster're pretty much screwed.
    personally i have never seen of or heard of that ever happening, but anything is possible i guess. you really don't put much torque on a chain when you apply a coaster brake, but if someone has a chain that is all rusty, never been maintained right, i suppose that it could break.
    I used to race bmx and all thatkind of stuff, and i have never seen a bike chain break from peddling or using a coaster brake.
    i'm not saying that it can't happen, i'm just saying that i have never seen it happen personally.
  19. 5-7HEAVEN

    5-7HEAVEN Guest

    How about if your bicycle chain fell off the sprockets? What happens then?

    Or how about if the coaster brake mechanism jams, going downhill @ 25mph?(That happened to me).

    Just saying.:grin5:
  20. rustycase

    rustycase Banned

    You guys are GREAT!
    This thread has brought me a whole bunch of valuable things to consider.

    I got in 6 more bikes day before yesterday, in response to my craigslist ad to recycle unwanted old bikes... None were serviceable, but I now am pleased to have a pretty good selection of brakes which I definitely shall use. I got caliper, center pull, V brakes, one cable-pull disk brake, and a bulldog. Now to determine which might work best.

    I'm one of those people on a low budget, (Do you hear the Kinks playing in the background?). Actually, I got NO budget and frequently gotta wait 'til something usable comes down the path...

    When running a coaster brake, I have had the drive chain break, or fall off, when pedaling, and when trying to brake, over the years of running less-than-optimal gear.

    I'm more conservative now, in my old age, and will be sure to have both front and rear brakes in good working order.

    Thanks to all who have contributed !