Red Bike – Gary Road Bike in London
Pinnacle Lithium bought March 2016
Gears 9 rear 11-32 and 3 front 42-32-22
Wheels 700 x 38C
Copper bike – Patricia Road Bike in London
Copper bike is 2012 model Trek Fx 3 ladies hybrid bought second-hand in October 2020
Gears 8 rear 11-32 and 3 front 48/38/28
Wheels 700 x 32C
Rim brakes
Blue Bike
Blue Bike is 2005 model Trek 4300 https://www.bikepedia.com/QuickBike/BikeSpecs.aspx?year=2005&brand=Trek%20&model=4300
Gears 8 rear 11-32 and 3 front replaced to be 22-44 orig 24-42
Grey Bike
Grey bike is 2007 model giant xtc-4.5
https://www.thebikelist.co.uk/giant/xtc-4-5-2007
Gears 9 rear 11-32 and 3 front 22-44
Tyres….
700 mm tyres have that as outer diameter
26 in tyres have 650 mm as outer diameter
If the front gear has f cogs, the rear gear has r cogs and the wheel diameter is w, then the distance travelled per full rotation of the pedals is proportional to:
f * w / r
Our bikes in Vernet are:
red:
w = 70 fmax = 54 rmin = 12 giving 315
w = 70 fmin = 39 rmax = 31 giving 88
blue Trek 4300 after changing front derailleur to use smaller sockets:
w = 65 fmax = 44 rmin=13 = 220
w = 65 fmin = 22 rmax = 30 =48
black:
w = 70 fmax = 47 rmin = 13 =253
w = 70 fmin = 28 rmax = 33 = 59
grey Giant xtc 45 :
w = 65 fmax = 44 rmin = 11 = 260
w = 65 fmin = 22 rmax = 32 = 44
