maths equation if anyone is interested?

I'm not sure exactly what you're after, but if you have roll-out distances for each gear, and either rpm or speed, you should be able to work out anything you want.

For example:

53/13 has an 8.594m roll-out (from the chart below)
38mph = 61.142kmh = 61,142 metres per hr = 1019 metres per minute.
1019/8.594 = 118.6rpm.

But this is probably unnecessary if you have your speed; although I'm not really sure what you want.

1 hr = 3600 seconds. So, for your 30 second interval: 3600/30 = 120

61.142kmh/120 = 0.5095km = 509.5 metres in 30sec at 61.142kmh (38mph)

Gear rollout distances

..........39.....42.....52.....53

11... 7.474 8.049 9.965 10.157
12... 6.851 7.378 9.135 9.310
13... 6.324 6.810 8.432 8.594
14... 5.872 6.324 7.830 7.980
15... 5.481 5.902 7.308 7.448
16... 5.138 5.534 6.851 6.983
17... 4.836 5.208 6.448 6.572
18... 4.567 4.919 6.090 6.207
19... 4.327 4.660 5.769 5.880
20... 4.111 4.427 5.481 5.586
21... 3.915 4.216 5.220 5.320
22... 3.737 4.024 4.983 5.078
23... 3.574 3.849 4.766 4.858
24... 3.426 3.689 4.567 4.655
25... 3.288 3.541 4.385 4.469
26... 3.162 3.405 4.216 4.297
27... 3.045 3.279 4.060 4.138
28... 2.936 3.162 3.915 3.990

http://www.analyticcycling.com/Powe...yGear_Disc.html

🙂

closesupport said:

eg. 53/13 and an average speed of 38 mph and wheel diametre to work out how much distance can be covered in 30 seconds.
.

38mph for 30 seconds.
38/60/60*30=0.3167 miles

xbgs351 said:

38mph for 30 seconds.
38/60/60*30=0.3167 miles

thankyou, now my training programs tells me the prefared distance to train over my optimal heart rate and zone setting for the cardiosport the time it should take (targets) the speed i should beable to train at over the set duration of time with recovery times for warm downs periods the amout of watts i should be generating and cadence i should aim to maintain to cover the set distance inrelation to the gears that i have selected to use (fixie).

now i need to set it all so i can choose the amount of effort i aim to train at from 45% - 100% (fatburning zones / to anerobic ) maybe a calorie counter as well... lol ain't excel fun...

closesupport said:

thankyou, now my training programs tells me the prefared distance to train over my optimal heart rate and zone setting for the cardiosport the time it should take (targets) the speed i should beable to train at over the set duration of time with recovery times for warm downs periods the amout of watts i should be generating and cadence i should aim to maintain to cover the set distance inrelation to the gears that i have selected to use (fixie).

now i need to set it all so i can choose the amount of effort i aim to train at from 45% - 100% (fatburning zones / to anerobic ) maybe a calorie counter as well... lol ain't excel fun...

Close : here is a website that gives distance covered for every turn or pedal stroke : 52x17 = 259.46 inches for each stroke.
259.46 divided by 12 = 21.62 feet distance travelled for each pedal stroke.

If you can maintain 80 revolutions per min, for one hour, using 52x17, you will travel 21.62 x 80 (80 rpm per minute) x 60 (number of minutes in an hour)
= 103,784 feet per hour or 19.65 miles in one hour.

http://www.panix.com/~jbarrm/cycal/cycal.30f.html

This calculator will directly give you the speed with no math on your part.
juniorvelo.comjuniorvelo.comOpen ↗

You just enter your cadence and select the chainrings and cogs you are interested in (and your wheel diameter). Results are available in kph and mph.