Went for a nice 50k ride yesterday, and when I was 10k from home, I approached a house with a long driveway. As I approached, I saw a young boy calling after his dog who had started to sprint down the driveway. As I passed the driveway, the dog was in full sprint, barking and agressive. He caught me, came close and made me think he was going to bite me at the ankles. I took some evasive action, upped my speed a bit, while the dog circled and came at me again.
Three times, he outsprinted me, barked like hell and made aggressive movements towards my ankles. I kept thinking "when is this dog going to get tired". I don't know if he got tired, or just bored, but when I finally left him behind my Polar CS200 heart rate monitor was at 101% and I was in the Shimano Capreo's 9 smallest tooth sprocket.
The Capreo freehub with it's 9-10-11-13-15-17-20-23-26 cassette is a godsend for small wheel bikes. With my 53/38 front chainring, it gives me approx 28-118 gear range on 20 inch tyres. The 118 inch top gear allows me to keep pedalling well beyond 50km/h, which is a great boost going downhill. The only other ways to achieve such a high gear on a Moulton is either use monster size chainrings (which I really dislike), or a Schlumpf Speed Drive. This is an expensive, but very nicely engineered internal planetary gear system that replaces your bottom bracket, and takes standard chainrings. I have seen one Pashley Moulton APB modified with a speed drive and double chainring, giving an amazing range of gears.
I do have a similar gearing with a 13t on a Rohloff Speedhub, the 14th gear equals a 9t sprocket then.
With a DualDrive or a SA Phenix hub, it is even easier to get high gears. I remeber that when a dog wanted to bite me, I shifted down so that my feet spinned faster and the dog could not catch them.
Has anyone tried this with an AM7?
What happens when 9t and 10t sprockets are no more?
Can a Capreo work in an AM7?