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What would your cadence be at 47mph?

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What would your cadence be at 47mph?

Old 09-23-05, 07:59 AM
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What would your cadence be at 47mph?

Someone on another forum is saying he can pedal his mtb downhill at 47mph with a 44 tooth chainring up front and an 11 tooth cog on the rear? How fast would he have to be pedalling to go this speed? I think he's full of crap quite honestly.
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Old 09-23-05, 08:06 AM
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checking the end-all-be-all of calculators (http://sheldonbrown.com/gears/), with 27" tires and 170mm cranks, 120rpms is (only) 38.6mph. But your friend is also going downhill, so depending on the hill, yeah, why wouldn't he reach 47mph, whether he pedals or not? In other words, 1) he's full of it if he thinks he's pedalling to get that speed, and 2) the huge hole in his declaration is "downhill".
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Old 09-23-05, 08:07 AM
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Roughly 150
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Old 09-23-05, 08:09 AM
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Originally Posted by SDRider
Someone on another forum is saying he can pedal his mtb downhill at 47mph with a 44 tooth chainring up front and an 11 tooth cog on the rear? How fast would he have to be pedalling to go this speed? I think he's full of crap quite honestly.
If he's running a 26" x 2.25" tire (with the standard 2115 mm circumference), he'd have to pedal at 149 rpm to reach that speed, according to the Gearing Calculator I built into CycliStats.
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Old 09-23-05, 08:11 AM
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47 mph on a mtb in 44-11. Hm... Did he say downhill or pushed out of a plane?
It's possible, but he'd have to be cranking his legs around at about 150 rpm. Maybe.
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Old 09-23-05, 08:11 AM
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Originally Posted by superdex
checking the end-all-be-all of calculators (http://sheldonbrown.com/gears/), with 27" tires and 170mm cranks, 120rpms is (only) 38.6mph. But your friend is also going downhill, so depending on the hill, yeah, why wouldn't he reach 47mph, whether he pedals or not? In other words, 1) he's full of it if he thinks he's pedalling to get that speed, and 2) the huge hole in his declaration is "downhill".
Yeah, he's claiming that he pedals pretty hard to reach that speed...

What is the fastest a person can theoretically pedal? I can do 100 fairly smoothly but much over that and I'm unstable.
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Old 09-23-05, 08:12 AM
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When I ride my road bike in 52 - 11. I run out of gear at about 43 mph. I have gotten up to 52.5mph. It certainly wasn't from pedaling.

I second the full of crap motion.
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Old 09-23-05, 08:16 AM
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Between 150 and 160 depending on the rear wheel size. I am a believer
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Old 09-23-05, 08:16 AM
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According to this calculator from this website , he'd be doing 150 rpm.

We don't know how steep this hill is, that is what is determing his speed. Now if he was some sort of super stud and managed to crank 150 rpm with a 44-11 ratio, on a flat road, several pro teams would be interested. Going downhill, even little ol' me can get that speed with a zero cadence.
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Old 09-23-05, 08:19 AM
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132 rpm in a 53-12 gets you there. As if I could really do that.
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Old 09-23-05, 08:27 AM
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Originally Posted by bbattle
According to this calculator from this website , he'd be doing 150 rpm.

We don't know how steep this hill is, that is what is determing his speed. Now if he was some sort of super stud and managed to crank 150 rpm with a 44-11 ratio, on a flat road, several pro teams would be interested. Going downhill, even little ol' me can get that speed with a zero cadence.
Yeah, I know. I hit 41.6mph downhill last Sunday on my roadbike. I pedaled a bit just to see if I could keep up and I could but I certainly wasn't increasing my speed by pedaling.

Edit-I just checked my rpm at that speed and it would be a little under 120. I was a bit unsteady keeping up with the speed of my bike.

Last edited by SDRider; 09-23-05 at 08:33 AM.
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Old 09-23-05, 08:31 AM
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Originally Posted by SDRider
Yeah, he's claiming that he pedals pretty hard to reach that speed...

What is the fastest a person can theoretically pedal? I can do 100 fairly smoothly but much over that and I'm unstable.
It is all about how you have conditioned your body.
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Old 09-23-05, 08:45 AM
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The fastest cadence I've been able to hold w/o bouncing around, was just over 140 (big gear ratio ). I've heard that track cyclists routinely go much faster.
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Old 09-23-05, 08:51 AM
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My cadence at that speed would be zero. I'd be coasting.
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Old 09-23-05, 08:59 AM
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I think it's briefly possible. Going down a longish hill, I got up to 45, but had to pedal to do it as the hill wasn't steep enough to coast that fast. That works out to roughly to a cadence of roughly 130 in 53/12. I'm certainly no sprinter, so 150 rpm+ seems plausible. The mountain bike part of the equation makes me pretty skeptical, though.

did
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Old 09-23-05, 09:07 AM
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Originally Posted by cydewaze
My cadence at that speed would be zero. I'd be coasting.
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Old 09-23-05, 09:15 AM
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I've tried to hold a cadence over a hundred so I could be like Lance but it wasn't fun and I couldn't stay at 100+ for very long on the road I was traveling, too many hills.

I'm working the mid-80's right now. I suppose if I am cruising along at that rate in 50-12, I'll have to go to a higher cadence. :-)
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Old 09-23-05, 09:18 AM
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Originally Posted by bbattle
I've tried to hold a cadence over a hundred so I could be like Lance but it wasn't fun and I couldn't stay at 100+ for very long on the road I was traveling, too many hills.

I'm working the mid-80's right now. I suppose if I am cruising along at that rate in 50-12, I'll have to go to a higher cadence. :-)
I can hold 100 pretty easily but spinning much faster than that I start to bounce a bit.

Thanks guys for all the responses. You guys are the best!
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Old 09-23-05, 09:21 AM
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We have a 2.5 mile hill where in the mid and early 90's we had a club ride going down the hill. In my 53-11, I could pedal OR coast ... and would reliably hit 50 to 52 pedaling or hit about 46 to 47 without pedaling. It was NOT easy or comfortable pedaling that fast!!!!

However, keep in mind that I'm a spinner in a big way. My normal cadence is 100 to 110. I can comfortably, without bobbing on the saddle, pedal up to 125rpm or so. It takes a LOT of practice ... serveral seasons back in the early 90's after blowing both knees.

So, even if this guy is full of hot air ... it is possible.
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Old 09-23-05, 10:31 AM
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Originally Posted by woodcycl
We have a 2.5 mile hill where in the mid and early 90's we had a club ride going down the hill. In my 53-11, I could pedal OR coast ... and would reliably hit 50 to 52 pedaling or hit about 46 to 47 without pedaling. It was NOT easy or comfortable pedaling that fast!!!!

However, keep in mind that I'm a spinner in a big way. My normal cadence is 100 to 110. I can comfortably, without bobbing on the saddle, pedal up to 125rpm or so. It takes a LOT of practice ... serveral seasons back in the early 90's after blowing both knees.

So, even if this guy is full of hot air ... it is possible.
You're on a road bike with a 53/11 though. He's claiming he's on a mtb with a 44/11, he'd have to be pedaling at about 150rpm.
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Old 09-23-05, 10:33 AM
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Originally Posted by SDRider
Someone on another forum is saying he can pedal his mtb downhill at 47mph with a 44 tooth chainring up front and an 11 tooth cog on the rear? How fast would he have to be pedalling to go this speed? I think he's full of crap quite honestly.
On my TT bike (that exact gearing), 44-11 is somthing around 150 RPMs like they said, by the time I hit about 44 I am done pedaling though... (something around 120 RPMs)...
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Old 09-23-05, 10:44 AM
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i've gone over 150rpm riding fixed, but as already mentioned the legs really aren't 'doing' anything at that point other than flailing.
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Old 09-23-05, 11:47 AM
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Originally Posted by SDRider
You're on a road bike with a 53/11 though. He's claiming he's on a mtb with a 44/11, he'd have to be pedaling at about 150rpm.

Very true ... a 44/11 would be tough if not close to impossible.
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Old 09-23-05, 11:48 AM
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most i ever hit was 46.9 going down a grade 6 hill on my mtb. I pedaled down a slight grade and just kept ging till there was no resistance on the grade 6.
to get that speed with a believeable cadence would take around a 60 12

60
12 47.1mph 120 cadence

BTW that is a typical cheap exorsise bikes gearing. I should know back in the day i snagged the front cog and free wheel off one for my bmx lol
I never came close to hitting those speeds on flats i could ride the bike all day long in that gearing at a slow speed. Its was a jumping bike that i use to ride down a lead in hill prior to hitting the jump. Even going down hill i could still feel alot of reistance. The hill in wqestion was close to grade 40. This was a hill behind a friend of mines house so it was dirt. But i think this should give every one a idea of just how hard it would be to hit 120 cadence flat land with such a gearing set up
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Old 09-23-05, 12:05 PM
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150 rpm is probably doable by most anyone with practice. I've hit 160 RPM momentarily (in like a 42x15 or 17 or something at 25ish mph on a flat)

I don't know why you'd spin that fast on a downhill, unless the bike's owner was chasing you on a roadie
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