CdA testing

CdA testing at Neaves Road... But probably a bit too much wind to get really accurate results.

Two tests. Each test was 2km out and back at target speed (kph) of:

- 26
- 32
- 38
- 44

The first set was at my current TT setup:

- Cervelo P2C
- seat in rear position
- bars set high (stem up)
- Bontrager Aeolus 6.5 wheels
- Veloflex Record Tubulars
- short sleeve skinsuit
- full finger gloves
- Rocket aero helmet
- Campanogla shoe covers
- bottle cage, no bottle

For the second test I move the seat to the forward position and reversed the stem to lower the bars (but moved up on the stack, probably about 1.5" lower.)

Results:

Test 1 Test 2
CdA 0.261 0.259
CRR 0.004 0.004

So perhaps a very slight difference in the setups with a preference to the seat forward position. But not outside the error range for the test conditions.

Probably the best I can say is that current CdA is no higher than about 0.260, and CRR no higher than 0.004. Good, but certainly not great.

The forward position with lowered bars was not very comfortable. I'm going to pickup a flat stem so I can try some intermediate positions. Forward but with more comfortable positioning of the bars.

Spread sheet