LarryOz
Cruzeum Curator & Sigma Wrangler
Recovery day, so I took the opportunity to do some more testing:
All testing done with 88mm wheel on front. 60mm on rear, power at 155 watts, 3 mile testing on 1/4 mile oval track.
I put a set of 170mm cranks back on my V20, and calibrated them to 170 on the Garmin = lap 2
Then I re-calibrated them at 140mm on the Garmin = lap 4: Shows that the wattage is vastly underestimated now. Still trying to figure out by how much, but the speed showed 2.38mph faster. I'll have to do some cogitating on this one. (Probably easiest to ride the 140mm at the 24.66 mph speed and see what wattage it would take)
The put 140mm set back on = lap6. 0.61mph faster on same wattage as 170mm cranks (when calibrated correctly)
...
Now helmets: #1 - Giro attack, #2 - Louis Garneau Rocket Aero, #3 - Caseo SpeedTime - all with their respective visors:
Giro = 23.29mph
LG = 23.35mph
SpeedTime = 23.47 mph (with significantly more wind than the others). That is 0.18mph faster than the Giro!
This would be equivalent to 0.51 miles over the course of a Century, or 78 seconds
I bought the LG helmet for $20 used on ebay, the Speedtime set me back $400. The Giro cost me $125 I think on a good sale.
$400 is pretty steep for a helmet (SpeedTime), so not sure it is worth that added expense, although I really like the was the visor wrapped around my ears. The wind noise was virtually eliminated! I did experience some minor lens fogging too, but it was 100% humidity. And did not do the "shaving creme" trick to the lens to try and prevent it from fogging. Of course if you where going for a Century record, 78 seconds would be hard to give up using the Giro!
All testing done with 88mm wheel on front. 60mm on rear, power at 155 watts, 3 mile testing on 1/4 mile oval track.
I put a set of 170mm cranks back on my V20, and calibrated them to 170 on the Garmin = lap 2
Then I re-calibrated them at 140mm on the Garmin = lap 4: Shows that the wattage is vastly underestimated now. Still trying to figure out by how much, but the speed showed 2.38mph faster. I'll have to do some cogitating on this one. (Probably easiest to ride the 140mm at the 24.66 mph speed and see what wattage it would take)
The put 140mm set back on = lap6. 0.61mph faster on same wattage as 170mm cranks (when calibrated correctly)
...
Now helmets: #1 - Giro attack, #2 - Louis Garneau Rocket Aero, #3 - Caseo SpeedTime - all with their respective visors:
Giro = 23.29mph
LG = 23.35mph
SpeedTime = 23.47 mph (with significantly more wind than the others). That is 0.18mph faster than the Giro!
This would be equivalent to 0.51 miles over the course of a Century, or 78 seconds
I bought the LG helmet for $20 used on ebay, the Speedtime set me back $400. The Giro cost me $125 I think on a good sale.
$400 is pretty steep for a helmet (SpeedTime), so not sure it is worth that added expense, although I really like the was the visor wrapped around my ears. The wind noise was virtually eliminated! I did experience some minor lens fogging too, but it was 100% humidity. And did not do the "shaving creme" trick to the lens to try and prevent it from fogging. Of course if you where going for a Century record, 78 seconds would be hard to give up using the Giro!
