CatGirl Posted October 16, 2009 Share can one convert this??? if you DONT have a HRM that measures it??? and visa versa...???? is there a mathematical formula???i have a normal cyclometer....with obvious km/h??? Link to comment Share on other sites More sharing options...
Willehond Posted October 16, 2009 Share No, unless you are riding a single speed bike, there is no relationship between speed and cadence. Gears are designed to give you a different cadance at the same speed. Link to comment Share on other sites More sharing options...
CatGirl Posted October 16, 2009 Share what would einstein say??? i DO believe you can convert the two!!!i'll lookup my math books an last resort google it.... Link to comment Share on other sites More sharing options...
Willehond Posted October 16, 2009 Share You don't need to be Einstein to figure this one out... Link to comment Share on other sites More sharing options...
CatGirl Posted October 16, 2009 Share i did NOT CUM LAUDE math university for nothing!!!! ask spud!!! Link to comment Share on other sites More sharing options...
Christopher Brunsdon Posted October 16, 2009 Share Someone did post that you can set your wheel size to x and then mount the speed sensor on your crank to get cadence (plus you needed to multiply by 100). I ended up getting a new computer with cadence off another hubber for R350 randts. Works better. Link to comment Share on other sites More sharing options...
Guest Agteros Posted October 16, 2009 Share Helloise, so for every moment of your bike ride doyou have stats of which gear you were in; whether you were actually pedalling;the speed you were travelling at? Link to comment Share on other sites More sharing options...
De Vlaamse Leeuw Posted October 17, 2009 Share its not that hard, since you need to convert from km/h to rev/min. Firstly you'll need the radius from the BB to where you'll attach the magnet. Then multiply by two PI to get circumference. This you will need to input into your cpu, as if it was your wheel's circumference. you now have the distance of one revolutions. You now have rev/h. Now just divide by 60 to get rev/min. Only used logic here, so theoretically it should work Link to comment Share on other sites More sharing options...
Willehond Posted October 17, 2009 Share Sometimes you really should just go and ride your bike Link to comment Share on other sites More sharing options...
De Vlaamse Leeuw Posted October 17, 2009 Share About to do that now. stunning day. cheers Link to comment Share on other sites More sharing options...
dollar Posted October 17, 2009 Share There is obviously a fixed relationship between cadence and speed - but PER GEAR RATIO. You could work out a rough indication that would tell you that in top (say 11/53) at 30kph your cadence is around 60 rpm. Link to comment Share on other sites More sharing options...
Minion Posted October 17, 2009 Share There is obviously a fixed relationship between cadence and speed - but PER GEAR RATIO.The problem is that freewheeling and dead points in your pedal stroke make the data pretty messy.As an example, here's some measured data for cadence and speed from a road ride and an IDT ride. You can see that the points cluster into specific bands, depending on the gear, but it's pretty rough. Link to comment Share on other sites More sharing options...
cat-i Posted October 17, 2009 Share what would einstein say??? i DO believe you can convert the two!!!i'll lookup my math books an last resort google it.... einstein would agree.except if you mount a separate meter-thingy to your cranks. Link to comment Share on other sites More sharing options...
cat-i Posted October 17, 2009 Share its not that hard' date=' since you need to convert from km/h to rev/min. Firstly you'll need the radius from the BB to where you'll attach the magnet. Then multiply by two PI to get circumference. This you will need to input into your cpu, as if it was your wheel's circumference. you now have the distance of one revolutions. You now have rev/h. Now just divide by 60 to get rev/min. Only used logic here, so theoretically it should work[/quote'] why would you need the radius? <confused?> you'd need a bit of maths to get from km/h to rev/h, no? won't it be easier to just set the circumference to a easlily-convertable number like 100 (or whatever 'easy' number the cyclometer would allow) ? cat-i2009-10-17 08:25:25 Link to comment Share on other sites More sharing options...
cat-i Posted October 17, 2009 Share why don't you just count it? coumt a few times on different gradients and surfaces, you'll quickly get a feel for it - you won't have a record of evrything, but if someone e.g. told you you have to cycle at 90, then count, arrive at 70, practice a little easier gears at same speed, and a month later count again? probably depends what you want to achieve with having the cadence .... if you have a personal couch that want that, or just want to know 'cos you're curious. i have heart rate monitor but only use the heart rates for the pretty pictures. an added unexpeted bonus was the altimeter, and i ended up using that a lot more on my rides - it makes prettier pictures Link to comment Share on other sites More sharing options...
Guest Agteros Posted October 17, 2009 Share cat-i now just imagine how pretty the picture can be with actual cadence and speed squiggled all over the 'prettier' picture you just painted Link to comment Share on other sites More sharing options...
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