Bike Forums - View Single Post - Garmin Vector Beta test

10-02-13 | 07:39 AM

#33

merlinextraligh

pan y agua

Joined: Aug 2005

Posts: 31,809

Likes: 1,231

From: Jacksonville

Bikes: Willier Zero 7; Merlin Extralight; Calfee Dragonfly tandem, Calfee Adventure tandem; Cervelo P2; Motebecane Ti Fly 29er; Motebecanne Phantom Cross; Schwinn Paramount Track bike

Quote:

Originally Posted by Hermes

. IMO, a torque wrench is required and the crowfoot socket a must. DC Rainmaker has a curve showing error as a function of torque. The curve is pretty flat around 25 foot pounds but greater or less torque causes power data accuracy problems.

I didn't use a torque wrench, and am not sure it's necessary.

DC Rainmaker's experience, chart, and discussions with Garmin, clearly show under tightening leads to inaccuracies.

My own experience with the left pedal apparently under reading is consistnet with that, in that tightening the pedal (and recalibrating) seemed to solve that.

I'm not sure that over tightening is a problem. In other words, I'm not sure you have to hit the 25 ft lbs precisely. Garmin's manual says 25-30ft lbs, and doesn't indicate that hitting it precisely is necessary for accuracy.

And as I read the chart, I don't see where it addresses torque above 25ft lbs

All that said I'm going to buy another torque wrench, and crow's foot, to spec it correctly.

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