Is this legit?

[Sidewinder Jerry]

Well I guesstimated my tire OD, and my girlfriend was right... I think things are bigger than they are. So they are really 26.5 OD, probably 26 when I sit on it. That isn't too high of RPM is it?

Have the tire perpendicular to the ground.
Put a level center of the top of the tire and level the level.
Measure from the bottom of the level to the ground.

This will be your true Outside Diameter. With my Kendra 838 tires the true OD is 26.25". To get calculations for most bicycle computers the wheel circumference is needed in millimeters for the calibration entry.

26.25 × pi x 25.4 = 2095

 

[Axl Myk]

We watched a snowmobile do 147mph at the Denver Bandimere drag strip.
Michigan considers an MB a moped. 100cc max, single speed, 30mph tops.

 

[Sidewinder Jerry]

We watched a snowmobile do 147mph at the Denver Bandimere drag strip.
Michigan considers an MB a moped. 100cc max, single speed, 30mph tops.

Given the right conditions many things become possible.

 

[Street Ryderz]

Went to the YouTube comments section on the video and the poster of the video told what his setup is. He's using an 8:22 drive with 27.5" wheels. This would be an 11.275:1 reduction. With that setup 10,337 rpm would produce a 75 mph speed. So now his statements are more consistent with his claims.

So if the video is faked and false information is in it, then it will be on the doubters to present why it isn't true. However, the math is valid with the claims. He also states he's going down a slight hill. One would have to question just how long 10,000+ rpm could be held without blowing the engine.

More BS from him trying to make it seem true, so then let me ask this, have you ever seen an 8t output gear? The chain will not wrap around an 8 tooth gears dia without bucking that's why the smallest is a 9t . He claimed @ 10,900 rpm not 10,337 and though that may not seem like a big difference it is with that much load, also a big factor is the pipe used and his is not a true tuned pipe and will not make or sustain the power needed to support this claim. The biggest thing though is the actual traveling speed shown in the video even with it speeded up it's not what 75 looks like, go travel in your car at 75 and take note of how fast things come up and go by it's not even close to being the same.

 

[Sidewinder Jerry]

More BS from him trying to make it seem true, so then let me ask this, have you ever seen an 8t output gear? The chain will not wrap around an 8 tooth gears dia without bucking that's why the smallest is a 9t . He claimed @ 10,900 rpm not 10,337 and though that may not seem like a big difference it is with that much load, also a big factor is the pipe used and his is not a true tuned pipe and will not make or sustain the power needed to support this claim. The biggest thing though is the actual traveling speed shown in the video even with it speeded up it's not what 75 looks like, go travel in your car at 75 and take note of how fast things come up and go by it's not even close to being the same.

The 8t sprocket was suspect to me as well. One could simply run a 11:30 and be close to the same ratio. If one had a machine shop and could make a 8t sprocket; I believe with so few teeth engaging the chain, it'd be susceptible to tooth sheer. He does have videos of building custom parts.

I myself have gone faster than 50 mph with a 33cc engine going down a long grade. As for the 10,900 rpm, I gave him the benefit of a doubt that he ment the engine could peak at that. In his comments on YouTube he does say 10,900 would produce a speed of 79.09 mph with his setup. All the GPS showed was a top downhill speed of 75 mph which would be 10,337 with his setup.

Films can be deceiving, hills may not look as steep as they really are; speeds may appear slower or faster than they really are. However, special computer programs can tell you exactly how fast something is going in a video.

 

[Street Ryderz]

The 8t sprocket was suspect to me as well. One could simply run a 11:30 and be close to the same ratio. If one had a machine shop and could make a 8t sprocket; I believe with so few teeth engaging the chain, it'd be susceptible to tooth sheer. He does have videos of building custom parts.

I myself have gone faster than 50 mph with a 33cc engine going down a long grade. As for the 10,900 rpm, I gave him the benefit of a doubt that he ment the engine could peak at that. In his comments on YouTube he does say 10,900 would produce a speed of 79.09 mph with his setup. All the GPS showed was a top downhill speed of 75 mph which would be 10,337 with his setup.

Films can be deceiving, hills may not look as steep as they really are; speeds may appear slower or faster than they really are. However, special computer programs can tell you exactly how fast something is going in a video.

If you want to give him the benefit of the doubt so be it !

 

[Sidewinder Jerry]

If you want to give him the benefit of the doubt so be it !

He's in Myrtle Beach SC., 75 mph down hill but it isn't likely on level ground. The video is misleading in that respects. Unless you read the comments it isn't stated otherwise.

 

[Axl Myk]

Well, completely real, or not, 75 on a bicycle? No thanks, I'll stay with 30.
I root for all you young-uns that want to try it. Just post what flowers you like before trying.

 

[Sidewinder Jerry]

Well, completely real, or not, 75 on a bicycle? No thanks, I'll stay with 30.
I root for all you young-uns that want to try it. Just post what flowers you like before trying.

I'm far from being young. I'm more than happy with 30 on level ground. Though I'll say a nice down burst can be exciting.

 

[Karl Snarl]

I put around at 18-20 and am very happy. With some bursts up to 30-35mph. It's awesome jumping a speed bump at 20mph!! Plus I'm old, at 75 I'd be in the ground soon after the crash. I'll stick to my motorcycles for speed, and my MB for pleasure cruising and trails. An the bragging rights that I built the bike myself.