rustychisel
Posts: 3491
Joined: Thu Jan 10, 2008 1:39 pm

Help needed from the mathematically inclined, please.

Fixed gear, 48x18 on 700c wheels, speed attained was 56.7kmh.
Can anyone tell me what cadence that equates to?

rkelsen
Posts: 4488
Joined: Mon Apr 20, 2009 10:41 pm

### Re: Cadence and speed calculation

2.1m (approx. 700c rollout) x 48/18 = 5.6m per 'rev'

56,700 metres/hour = 945 m/minute

945/5.6 = 169 rpm.

brauluver
Posts: 3646
Joined: Thu Sep 11, 2008 10:23 pm

### Re: Cadence and speed calculation

rustychisel wrote:Help needed from the mathematically inclined, please.

Fixed gear, 48x18 on 700c wheels, speed attained was 56.7kmh.
Can anyone tell me what cadence that equates to?

I'll post you link when I get home that has it all covered.

rustychisel
Posts: 3491
Joined: Thu Jan 10, 2008 1:39 pm

### Re: Cadence and speed calculation

thanks, hmmm 169rpm seems much higher over sustained effort. Thought I was nearer the 200.

I was over 55kmh for quite some time, maybe 250m, going down the hill north from the Morialta Falls main gates past the Black Hill Conservation Park, on the fixed, of course, Saturday morning.

brauluver
Posts: 3646
Joined: Thu Sep 11, 2008 10:23 pm

### Re: Cadence and speed calculation

plug the permutations into this http://software.bareknucklebrigade.com/

boyracer
Posts: 757
Joined: Wed Sep 10, 2008 9:29 pm

### Re: Cadence and speed calculation

rustychisel wrote:thanks, hmmm 169rpm seems much higher over sustained effort. Thought I was nearer the 200.

I was over 55kmh for quite some time, maybe 250m, going down the hill north from the Morialta Falls main gates past the Black Hill Conservation Park, on the fixed, of course, Saturday morning.

so will we be seeing you at friday roller racing then?

rustychisel
Posts: 3491
Joined: Thu Jan 10, 2008 1:39 pm

### Re: Cadence and speed calculation

where? when?

You callin' me out?

yehuwdiy
Posts: 336
Joined: Sat Aug 28, 2010 10:35 pm

### Re: Cadence and speed calculation

Holy bat cave Rustychisel, I think my knees just blew out reading that! You must have rotary legs to spin at those kinds of speeds

##Edited, thanks!
Last edited by yehuwdiy on Wed Oct 06, 2010 9:44 pm, edited 1 time in total.

brauluver
Posts: 3646
Joined: Thu Sep 11, 2008 10:23 pm

### Re: Cadence and speed calculation

yehuwdiy wrote:Holy bat cave Rustychisel, I think my knees just blew out reading that! You must have rotary legs to spin at those kinds of speeds

Fixed that for ya.

boyracer
Posts: 757
Joined: Wed Sep 10, 2008 9:29 pm

### Re: Cadence and speed calculation

Edwardstown velodrome clubrooms friday evening. pacc.org.au
I'm pretty keen and think a few tuesday riders will be on it.

rustychisel
Posts: 3491
Joined: Thu Jan 10, 2008 1:39 pm

### Re: Cadence and speed calculation

yehuwdiy wrote:Holy bat cave Rustychisel, I think my knees just blew out reading that! You must have rotary legs to spin at those kinds of speeds

##Edited, thanks!

nay, knees blow out at the other end of the spectrum, doing 8kmh and blowing snot trying to work the same gear through the Montacute Road valley.

brauluver
Posts: 3646
Joined: Thu Sep 11, 2008 10:23 pm

### Re: Cadence and speed calculation

boyracer wrote:Edwardstown velodrome clubrooms friday evening. pacc.org.au
I'm pretty keen and think a few tuesday riders will be on it.

Pity about the \$70 odd buck\$ to enter

boyracer
Posts: 757
Joined: Wed Sep 10, 2008 9:29 pm

### Re: Cadence and speed calculation

killed it for a lot of us....