Shimano SM-PM40 Power Modulator?
09-30-11, 11:03 PM
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What, me worry?
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Shimano SM-PM40 Power Modulator?
Hello everyone,
Just received my new bike and have a question concerning a part I've never seen before.
Just above the front v-brake, there's a small cylinder (Shimano SM-PM40) with the brake line passing though it. What does this do exactly?
Thanks!
Telly
Just received my new bike and have a question concerning a part I've never seen before.
Just above the front v-brake, there's a small cylinder (Shimano SM-PM40) with the brake line passing though it. What does this do exactly?
Thanks!
Telly
09-30-11, 11:12 PM
#2
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It's spring-loaded and is intended to make your brakes spongy and ineffective-- WAIT, no, the script says it helps you avoid applying excessive front brake force and flinging yourself over the handlebars. Yeah, that.
09-30-11, 11:51 PM
#3
What, me worry?
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The day I manage to fling myself over the handlebars from excessive use of the front brake (Clydesdale here), I'll be a happy bloke! 
Another little trinket that sounds cool, makes things worse, and adds more parts to break down during a ride... that's gone!
Thanks mechBgon
Another little trinket that sounds cool, makes things worse, and adds more parts to break down during a ride... that's gone!
Thanks mechBgon
10-01-11, 02:29 AM
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Those accidents still occur every now and then, regularly followed by people blaming the bike, and the brake.
I don't get it, twisting the bar too sharply will send you tumbling just as well, and I don't see any steering dampers being added.
10-02-11, 06:38 AM
#5
What, me worry?
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Ahhh shucks... too late! lol
https://www.dirtragmag.com/reviews/hopey-steering-damper
10-02-11, 01:02 PM
#6
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That problem was solved by the bicycle helmet. When going over the bars, most people had enough time to get an arm out and too many collarbones were breaking hence the need for the power modulator. It all makes perfect sense really.
10-02-11, 01:22 PM
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Poor Shimano, when they do dumb things they get called out.
Compare this to Campagnolo's providing paired brakes with the rear having less leverage and claiming it improves modulation, and helps prevent rear wheel lockup. Folks say "gee, what a great idea".
The irony is that Shimano's gadget is intended for newbie's and casual riders who can be expected to be unskilled, whereas Campagnolo's is intended for serious riders who should be expected to know how to modualte braking for either wheel correctly.
I guess it's all in the presentation.
Compare this to Campagnolo's providing paired brakes with the rear having less leverage and claiming it improves modulation, and helps prevent rear wheel lockup. Folks say "gee, what a great idea".
The irony is that Shimano's gadget is intended for newbie's and casual riders who can be expected to be unskilled, whereas Campagnolo's is intended for serious riders who should be expected to know how to modualte braking for either wheel correctly.
I guess it's all in the presentation.
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“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
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