Have a question. I have my ibike dialed in with my power numbers in training. I am doing a half ironman race in two weeks. I will be adding an aero helmet and a disc for the race...how do I adjust my settings to have the watts read accurately? This is the first time I have ever raced with power as a guide.
I would appreciate any suggestions, opinions.
Adjusting Newton for other aero factors for race
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blueraidermike
- Posts: 19
- Joined: Tue Oct 04, 2011 8:38 am
Re: Adjusting Newton for other aero factors for race
blueraidermike,
The most accurate way is to do cal ride with coastdowns with that equipment to develop a matching profile.
A couple of short cut ways to get (how?) close would be:
1. Assuming you are using same tires and pressures for should be same Crr, do a few runs down a hill and analyze the Cda displayed while coasting. I would do it with current equipment several times and with the race equipment several times to average results and then manually tweek a custom profile. It is probably less work to do the cal ride : -) Of course no wind or stable wind conditions are desired.
2. Look online for other riders or research values for two positions and wing a manual tweek of a custom profile (least physical work and perhaps the fastest but probably least accurate).
Regards,
Russ
The most accurate way is to do cal ride with coastdowns with that equipment to develop a matching profile.
A couple of short cut ways to get (how?) close would be:
1. Assuming you are using same tires and pressures for should be same Crr, do a few runs down a hill and analyze the Cda displayed while coasting. I would do it with current equipment several times and with the race equipment several times to average results and then manually tweek a custom profile. It is probably less work to do the cal ride : -) Of course no wind or stable wind conditions are desired.
2. Look online for other riders or research values for two positions and wing a manual tweek of a custom profile (least physical work and perhaps the fastest but probably least accurate).
Regards,
Russ
Re: Adjusting Newton for other aero factors for race
Crr might change if the disc setup also has a tubular and the regular setup is a clincher. Compare the race setup with your everyday setup on the same bike. You can always post your profile which might give some clues.
Fernando