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recommended gear cycle computer

a cycle computer that recommends what gear you should be in
(+1, -1)
  [vote for,

The cycle computer measures the crank rpm and wheel rpm and calculates what gear you should be in.
xaviergisz, Aug 05 2010

Bicycle Automatic Transmission http://www2.bsn.de/...icles/browning.html
[Cedar Park, Aug 05 2010]

What gear? http://en.wikipedia...ingle-speed_bicycle
[pocmloc, Aug 06 2010]


       But surely it would just flash up "Lycra" all the time?
MaxwellBuchanan, Aug 05 2010

       A cadence sensor essentially does this.
MechE, Aug 05 2010

       Ha, as soon as I posted this I knew that comment was imminent, MB.   

       21, you could configure it to suit your bike. If you don't like the recommendations you could turn it off or ignore it. It might be useful for learning and training.
xaviergisz, Aug 05 2010

       I was always told that 1rpm at the pedals was about optimum, and to change gears until you could just maintain that pace.
MaxwellBuchanan, Aug 05 2010

       1 rpm! really????
WcW, Aug 06 2010

       It better be able to guess in advance when you want to accelerate; otherwise it'll just Schleck your chain.
lurch, Aug 06 2010

       What [WcW] said.
Grogster, Aug 06 2010

       1 RPS is kind of the low end, and I suspect that's what MB was thinking of, a cadence of 60-90 is considered good, but yes, steady, with the gearing to get the speed/power needed.
MechE, Aug 06 2010

       //1 rpm! really????//   

       Ah, yes. Well. I lapsed into Norlandic there by mistake (1 restovarti parse menustia). 1 rps in English.
MaxwellBuchanan, Aug 06 2010

       (sp. "restøvarti pårse menùstia")
hippo, Aug 06 2010

       Doesn't it need to measure torque too?
ldischler, Aug 06 2010

       //Doesn't it need to measure torque too?//   

       Good question, not sure of the answer. But measuring torque is hard on a bike (or at least not immediately obvious to me).   

       maybe another sensor such as an inclinometer would provide sufficient information to calculate a reasonable recommendation (though you might need to assume other forces such as wind and rolling resistance remain constant).
xaviergisz, Aug 06 2010

       So add an anemometer and tyre pressure & wear sensors.
pocmloc, Aug 06 2010

       There are ways to measure power output on a bike, but they are not cheap (search "power tap").
MechE, Aug 06 2010

       //sp. "restøvarti pårse menùstia"//   

       Hippo!!!! You're family was from the Southern Basin of Norlandia too??? Pichienka vaarti!! Minchki pichienka pichienki!! Dobrania! (I was never a stickler for the accents; Professor Krapinska would be so ashamed of me.)
MaxwellBuchanan, Aug 06 2010

       [MaxwellBuchanan], [hippo] I have urgent news. "Professor" Krapinska now has advanced dementia, and is aphasic for all of her many languages, excepting only some remnants of Norlandic, which, unfortunately, she herself invented. You are as yet the only victims of her Norlandic private tuition scam to come forward, hence, the only people who can communicate with her.   

       Her consent is urgently needed for a business transaction amounting to hundreds of millions (of Seychelles sea shells, but still, it's a lot). There's big money in it for you if you'll just contact ... now where did I put that address. Getting more forgetful every day, darn it.
mouseposture, Aug 07 2010

       Oh Cråhp!
hippo, Aug 07 2010

       I'm very sad to hear that Prof. Krapinska's mind has finally gone. However, I would like to congratulate him on having the chutspa to go through with the sex change operation. Berastranya, Professor, and ludka plotchim.
MaxwellBuchanan, Aug 07 2010

       Surely you mean her *second* sex change operation?
hippo, Aug 07 2010

       Hah! (S)he used to tell all his freshman students that one. I expect he told you the one about his dealings with the local Chen'tolayas after he was caught trying to sell a box of vetrjinkos to his classmates back at Nevroskaja Collective? Did he show you the scar on his pyr-pruppeski?
MaxwellBuchanan, Aug 07 2010


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