- Feedback
- View
heres my English Cycles 'special' from ten years ago - the downhill parts of Cannock were... interesting
Hub/Drum Brake Bikes
- Thread starter GrahamJohnWallace
- Start date
Mickeyspinn
rBotM Winner
Sounds reassuring! My build will be 70mm sturmey drums and two finger levers!
I guess I'll be faster downhill than most
Do you have an obituary ready?Sounds reassuring! My build will be 70mm sturmey drums and two finger levers!
I guess I'll be faster downhill than most
Mickeyspinn
rBotM Winner
No I'll leave that to you guys...
My epitaph is ready tho...
"Here lies the fastest drummer"
My epitaph is ready tho...
"Here lies the fastest drummer"
Mickeyspinn
rBotM Winner
John Bonham eat your heart out !
- Feedback
- View
In nearly 40 years experience of riding off-road on drum-brakes I have only gone down like a led zeppelin once.
This was last winter when a front 90mm Shimano Roller brake failed when I was going down a sunken track that gets steeper and steeper the further you go down. Despite pulling on the brake-levers as hard as I could I was unable to stop the bike from going faster, and because the lane was sunken there was no escape route. Knowing how steep the track got further on the only option I had was to bale out at speed or to ride up the side of the steep bank of the lane in an attempt slow down. I instinctively went for the latter but the the bike stopped violently when it hit a tree and was thrown back into the ditch. I was lucky to escape with only grazes and a sprained arm.
When I later looked at the Roller brake there was no obvious problem. But no matter how I adjusted it it would not lock. When I compared it with another 90mm front Roller-brake I noticed that its cam was much smaller and the rollers much larger. On disassembly, I noticed the Rollers had damaged the inclined plane that pushes them into the shoes. This damage was preventing the brake from applying any harder as the brake was applied further. When I looked online for a replacement brake I found that Shimano had discontinued this small-cam model.
The 70mm Roller brakes I and others have used with out problems for for over 15 years have large cams. The current 90mm ones have large cams. So it looks like Shimano experimented with small cams on this model before realising it was a seriously bad idea and reverting back to the reliable earlier mechanism.
It seems to me that the above is an example of the old engineering adage: "If it ain't broke, don't try and fix it" In this case improve it.
The Leleu brakes have a patent marking that predates 1968 and the exact same design still being sold in the US today. They worked well in 1968 and with basic maintenance still do on a 40 year old Cleland bicycle. When Sturmey Archer tried to adopt the Leleu mechanism in the late 1980's they made a mistake that could cause the prototype brakes to lock on unexpectedly. However, unlike Shimano, SA never sold their dodgy design to the public.
- Feedback
- View
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
- Feedback
- View
Interesting commuter bike. I have seen Shimano roller brakes with belt drives before, but not an old-school Sturmey Archer drum.
I like the use of bull-horn handlebars. I have a similar arrangement on my Moulton APB and find it to be very comfortable.
When riding in traffic and built up areas, I find it easier to constantly cover the brakes, than with drop handlebars.
Also, with the hub gears you don't need to go down the gears when approaching traffic lights. Just stop, and back-pedal to move to a lower gear for a quick start. The same applies to using hub-gears off-road, after something forces you to brake unexpectedly.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
- Feedback
- View
Yes, I have an Alpine hub on my all-purpose bike, which I really like. I'd definitely be interested in a setup like that as a winter bike if I was commuting at the moment.
