The Giant OCR3 has a 30/42/52 front triple chainring setup (I'm going to assume a 170mm crank) and a SRAM PG-950 12-26 cassette with a gear breakdown of 12-13-14-15-17-19-21-23-26. Based on that data and assuming a nominal 27" wheel diameter, I plugged everything into the gear calculator at
this website and got the following shifting pattern.
Code:
Gear-Inch Chart
(9) (8) (7) (6) (5) (4) (3) (2) (1)
| 12 13 14 15 17 19 21 23 26
----+------------------------------------------------------
52 | 114.3 105.5 98.0 91.4 80.7 72.2 65.3 59.6 52.8
42 | 92.3 85.2 79.1 73.9 65.2 58.3 52.8 48.2 42.6
30 | 65.9 60.9 56.5 52.8 46.5 41.6 37.7 34.4 30.4
Semi-Log Graph
2 3 4 5 6 7 8 9 1 1 2 3
----------------------------------------------------------------------------------
I 1 2 3 4 5 6 7 8 9
M 1 2 3 4 5 6 7 8 9
O 1 2 3 4 5 6 7 8 9
Sheldon Brown's Gain Ratio Chart
| 12 13 14 15 17 19 21 23 26
----+------------------------------------------------------
52 | 8.54 7.88 7.32 6.83 6.03 5.39 4.88 4.46 3.94
42 | 6.90 6.37 5.91 5.52 4.87 4.36 3.94 3.60 3.18
30 | 4.93 4.55 4.22 3.94 3.48 3.11 2.82 2.57 2.27
Rollout Table in Inches
| 12 13 14 15 17 19 21 23 26
----+---------------------------------------------------------------
52 | 359.1 331.5 307.8 287.3 253.5 226.8 205.2 187.4 165.7
42 | 290.0 267.7 248.6 232.0 204.7 183.2 165.7 151.3 133.9
30 | 207.2 191.2 177.6 165.7 146.2 130.8 118.4 108.1 95.6
The semi-log chart is probably what you're looking for. This chart shows gear position as overlayed onto a development table. Across the top are gear-inches. The letters on the side denote (I)nner, (M)iddle and (O)utter chainrings and the numbers in each row indicate cog position with 1=26T and 9=12T.