With only 7 days left before the Giro de Hotaka, I am planning to go on an extra-long “toge-busting” ride tomorrow cresting some 9 mountain ridge and tracking a nicely-shaped loop like this: Sekidobashi -> ①WADA-> ②TAWA -> ③TSURU -> ④IMAGAWA -> ⑤YANAGISAWA -> Enzan -> Katsunuma -> ⑥SASAGO* -> ⑦SUZUGANE -> ⑧HINAZURU -> ⑨OTARUMI -> Sekidobashi...
(*completion of old & haunted Sasago tunnel repair works slated for today!...sure hope it will be passable tomorrow!!)
Bike: Colnago / Wheels: Fulcrum R-3 / Gear ratio: F 50X34T B 11-23T
Morning ride with daughter to recuperate: OTARUMI -> MAKIME -> OTARUMI
Bike: Vlaams / Wheels: Shimano RS20 / Gear ratio: F 52X39T B 12-25T
All-day Chichibu pilgrimage: Sekidobashi -> Ome -> SHOMARU -> KARIBAZAKA (the long pancake approach cutting KAOBURI) -> Green Line over SHIRAISHI & SADAMINE -> R11 + some Fudasho (possibly Shinpukuji) -> R299 -> YAMABUSHI -> Ome -> Sekidobashi
Bike: Vlaams / Wheels: Spinergy / Gear ratio: F 52X39T B 12-27T
To avoid getting burned out and to allow my body to recuperate in time for the Hotaka event, I plan to do the Sat and Mon rides at a leisurely but steady pace maintaining as much as possible a 70rpm cadence on the climbs. I am still undecided as to which bike, wheels and sprocket to take to Hotaka. In view of the variegated parcourse and the +22% slope on the Day 1 Hillclimb, I am leaning towards the Monday set-up with the wider gear ratio and the softer wheels.
…Or perhaps an even more forgiving and cushiony combination such as the springy 27T-sprocketed Spinergy wheels on the soothing Colnago CLX frame?? I might test for the first time the efficiency of this combination on Sunday afternoon.
Gear ratio memo to myself:
Supposing a cadence of 70rpm (the ideal number of revolutions for hillclimbs excluding +12% spikes), then:
a compact drive 34T (Colnago) combined with a 23T cog will produce a speed of 13.0 km/h
34T combined with a 25T cog → 12.0 km/h
34T + 27T → 11.1 km/h
A normal drive 39T (VLAAMS) combined with a 23T cog will produce a speed of 14.9 km/h
39T combined with a 25T cog → 13.7 km/h
39T + 27T → 12.7 km/h
To climb hills with maximum efficiency, one must find the ideal gear ratio adapted to one’s engine (= heart, lungs and legs) so as to be able to maintain 70 revolutions per minute.
vrijdag 31 oktober 2008