Hi,
In order to measure the grade at certain sections of a very (very) steep ‘service road’, I checked the LISTING file of the POLAR software and copied it to an excel spreadsheet.
Parameters are sampled every 5 sec. and I was dividing the ‘change in Altitude’ by the ‘change in distance’
Theoretically this should be the way to measure.. only there are sections there that the ratio over one sample is even higher then 50% !! (attached XLS spreadsheet).
Well this hill is indeed very steep – I climb with CX bike (CX tires) and use ring/cog 34/34 or 34/30 - lean forward and even when the road is dry, I feel some slidings at the rear wheel…!!
Altitude values are negative as the part of the place is below sea level
Does it make sense .. what can be the wrong things here.. ? Thanks!!
HR
spd
altitude
distance
Grade..!!
159
5.5
-70
14.678
4
-7
-57.14%
160
4.9
-68
14.685
2
-7
-28.57%
159
5.1
-67
14.692
1
-8
-12.50%
158
5.7
-66
14.7
1
-12
-8.33%
159
8.3
-64
14.712
2
-11
-18.18%
163
7.8
-62
14.723
2
-11
-18.18%
166
7.8
-58
14.734
4
-8
-50.00%
169
6.1
-55
14.742
3
-8
-37.50%
170
5.4
-53
14.75
2
-7
-28.57%
170
5.1
-52
14.757
1
-7
-14.29%
169
4.9
-50
14.764
2
-7
-28.57%
167
4.7
-50
14.771
0
-7
0.00%
166
4.8
-47
14.778
3
-7
-42.86%
165
5.2
-45
14.785
2
-8
-25.00%