|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
Roller brakes: running friction?
Shimano says the following about their roller brakes: "Inter-M brake is
different from conventional brakes in that the inside of the brake drum is filled with grease. This may cause the turning of the wheel to be slightly heavier than usual, particularly in cold weather" 1. So they have running friction. Does anybody know anything more about this? 2. They say that there should be 15 mm of play in the brake lever. That is a lot of movement. Perhaps the gap between pad and drum needs to be large to reduce the drag caused by the grease in the gap. Is that the reason? |
Ads |
#2
|
|||
|
|||
Roller brakes: running friction?
|
#3
|
|||
|
|||
Roller brakes: running friction?
I wrote:
wrote: 2. They say that there should be 15 mm of play in the brake lever. That is a lot of movement. Perhaps the gap between pad and drum needs to be large to reduce the drag caused by the grease in the gap. Is that the reason? I suppose so, but the play is only apparent when rocking a stopped bike back and forth with the brake on. You don't notice it when braking normally. Sorry, I misunderstood what "play" you were referring to (there is some fore & aft play too). I would what Shimano are talking about: "lever travel". That is a lot of movement. Perhaps the gap between pad and drum needs to be large to reduce the drag caused by the grease in the gap. Is that the reason? Yes indeed. Don't expect it to be a powerful brake! Advantages, though: reduced cleaning and maintenance, zero rim wear, no need to have rim perfectly true. ~PB |
#4
|
|||
|
|||
Roller brakes: running friction?
|
#5
|
|||
|
|||
Roller brakes: running friction?
Thanks for the replies. By 'play' I meant 'lever travel'. More quotes
from Shimano: "Turn the cable adjusting bolt of the brake unit or brake lever so that there is about 15 mm of play in the brake lever." "The amount of movement in the inner cable must be 14.5 mm or more when the brake lever is depressed. If it is less than 14.5 mm, braking performance will suffer, and the brakes may fail to work." Perhaps that last sentence indicates that: friction - heat - reduced performance "If you apply the front Inter-M brake strongly while the bicycle is stopped and then shake the wheel, you will notice that there is a small amount of play in the brakes. This is normal, and will not cause any problems at all while riding." "The front Inter-M brake has a built-in power modulator which controls the braking force applied to the hub. Noise is generated by the operation of the power modulator when the brake is applied, but this is not a sign of a malfunction." Curiouser and curiouser. |
#6
|
|||
|
|||
Roller brakes: running friction?
|
#7
|
|||
|
|||
Roller brakes: running friction?
Alex Rodriguez wrote:
An adequate brake should be able to lock up the wheel. Shimano says that the power modulator (a clutch) in the brake "prevents the wheel from locking-up if the brake force is getting too strong." See their picture at: http://cycle.shimano-eu.com/publish/...the_power.html |
#8
|
|||
|
|||
Roller brakes: running friction?
In uk.rec.cycling Alex Rodriguez wrote:
In article , says... As another poster observes, you don't get disc brake standard instant stopping with hub brakes but it is more than perfectly adequate. Adquate for what? I have a Nexus 7 and I can grab the brake till it touches the bar and it only slows the bike down a bit. An adequate brake should be able to lock up the wheel. If my bike had cantilever studs I would have gotten rid of this brake. Especially since I just found out the brake weighs over a pound. i am looking at a ridgeback switch at the moment. i was trying to get one with disk brakes but they're out of stock. the guy in the shop said hub brakes are better anyway. are you saying this isn't true? what about hub gears (nexus 8) vs regular derailleurs (shimano deore)? |
#9
|
|||
|
|||
Roller brakes: running friction?
"Alex Rodriguez" wrote in message
... Adquate for what? I have a Nexus 7 and I can grab the brake till it touches the bar and it only slows the bike down a bit. An adequate brake should be able to lock up the wheel. Apply the front brake sufficiently and it will be able to :-) Seriously, the back brake shouldn't be doing much of the slowing anyway, so being a bit crap isn't much of a problem. Unless the front brake is also crap. (This does not apply to tandems :-) ) cheers, clive |
#10
|
|||
|
|||
Roller brakes: running friction?
Clive George wrote:
"Alex Rodriguez" wrote in message ... Adquate for what? I have a Nexus 7 and I can grab the brake till it touches the bar and it only slows the bike down a bit. An adequate brake should be able to lock up the wheel. Apply the front brake sufficiently and it will be able to :-) Seriously, the back brake shouldn't be doing much of the slowing anyway, so being a bit crap isn't much of a problem. Agreed. Unless the front brake is also crap. Roller brakes can be used up front as well. It's one way to make you ride extremely carefully, I suppose ;-) ~PB |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Pedersen self energizing brakes. | Dan Burkhart | Techniques | 70 | June 12th 05 10:25 PM |
Shimano roller brakes with drop bar levers? | Brian Smith | Techniques | 5 | January 31st 05 03:16 AM |
V Brakes. Front/Rear? (Avid Ti) | Pizza Man | Techniques | 2 | November 22nd 04 05:46 AM |
Disc brakes squeal due to loose pads? | Michael Press | Techniques | 64 | June 24th 04 02:45 PM |
Drum-Brake Reliable for Long, Steep Descents? | Elisa Francesca Roselli | General | 45 | October 8th 03 01:34 AM |