Go Back  Bike Forums > Bike Forums > Road Cycling
Reload this Page >

"Engine braking?" etc.

Search
Notices
Road Cycling “It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle.” -- Ernest Hemingway

"Engine braking?" etc.

Thread Tools
 
Search this Thread
 
Old 02-13-15, 07:08 PM
  #26  
Senior Member
Thread Starter
 
kbarch's Avatar
 
Join Date: Aug 2014
Posts: 4,286
Mentioned: 21 Post(s)
Tagged: 0 Thread(s)
Quoted: 1096 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Originally Posted by unterhausen
I had a car that it made sense to downshift when you wanted to accelerate quickly, 3rd was zippy whereas 4th and 5th were not. Generally, I find that I do the same on my bike
Either you normally ride at a pretty low cadence, or else you pedal EXTREMELY fast when you do that.
I'm not sure I'm following why you would up-shift to slow. I can see why you would want to lower your cadence, but just slowing in the same gear does that.
I don't do it in order to slow down. It's just something I do when I want to avoid freewheeling or coasting.

Last edited by kbarch; 02-13-15 at 07:12 PM.
kbarch is offline  
Old 02-13-15, 07:23 PM
  #27  
ka maté ka maté ka ora
 
pdedes's Avatar
 
Join Date: Oct 2008
Location: wessex
Posts: 4,423

Bikes: breezer venturi - red novo bosberg - red, pedal force cg1 - red, neuvation f-100 - da, devinci phantom - xt, miele piste - miche/campy, bianchi reparto corse sbx, concorde squadra tsx - da, miele team issue sl - ultegra

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 25 Post(s)
Likes: 0
Liked 3 Times in 3 Posts
Originally Posted by kbarch
Just something to think about, really. It wasn't complicated to do under the circumstances, just complicated to explain.

I don't entirely object to freewheeling, but I don't like yo-yo-ing or coasting too much. By avoiding it, one maintains more precise control of speed and changes in speed.
you get better control by feathering front or rear brakes as needed to shift your weight distribution. i'll sometimes drag brake the rear while pedalling through a tricky set of corners.
pdedes is offline  
Old 02-13-15, 07:31 PM
  #28  
Senior Member
 
Drew Eckhardt's Avatar
 
Join Date: Apr 2010
Location: Mountain View, CA USA and Golden, CO USA
Posts: 6,341

Bikes: 97 Litespeed, 50-39-30x13-26 10 cogs, Campagnolo Ultrashift, retroreflective rims on SON28/PowerTap hubs

Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 550 Post(s)
Liked 325 Times in 226 Posts
Originally Posted by Bunyanderman
I wonder how this applies to normal riders and racers, I feel as if the study was done on pros and elite riders.
I think peak power happens in the same place but it's lower which makes sense because it's about muscle fiber recruitment - you need all yours involved to hit your peak.

Going over peaks in Golden Cheetah I found that I don't break 700W below 100 RPM and my power peaks for 5, 10, 15 seconds all seem to be around 120 RPM. At 130 RPM my legs still work that well, and although I can spin 140 the numbers aren't up there.
Drew Eckhardt is offline  
Old 02-13-15, 08:27 PM
  #29  
Senior Member
Thread Starter
 
kbarch's Avatar
 
Join Date: Aug 2014
Posts: 4,286
Mentioned: 21 Post(s)
Tagged: 0 Thread(s)
Quoted: 1096 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Originally Posted by pdedes
you get better control by feathering front or rear brakes as needed to shift your weight distribution. i'll sometimes drag brake the rear while pedalling through a tricky set of corners.
Absolutely, and more often I'll do that, too, but I like to avoid throwing away energy warming up rims if I can.
kbarch is offline  
Old 02-13-15, 08:29 PM
  #30  
~>~
 
Join Date: Mar 2013
Location: TX Hill Country
Posts: 5,931
Mentioned: 87 Post(s)
Tagged: 0 Thread(s)
Quoted: 1112 Post(s)
Liked 180 Times in 119 Posts
Originally Posted by kbarch
I don't do it in order to slow down. It's just something I do when I want to avoid freewheeling or coasting.
Isn't that just loafing, screwing around, dawdling or outright plootering about?
Miss Marple mastered that technique ambling though the village on her '52 AW Sports on the way to the parsonage for tea quite some decades ago.

She was an admirable club time trialist running an 83" fixed in her day for the 25 mile event but no one could avoid freewheeling or coasting quite like Miss Marple "back when".

-Bandera
Bandera is offline  
Old 02-13-15, 09:11 PM
  #31  
ka maté ka maté ka ora
 
pdedes's Avatar
 
Join Date: Oct 2008
Location: wessex
Posts: 4,423

Bikes: breezer venturi - red novo bosberg - red, pedal force cg1 - red, neuvation f-100 - da, devinci phantom - xt, miele piste - miche/campy, bianchi reparto corse sbx, concorde squadra tsx - da, miele team issue sl - ultegra

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 25 Post(s)
Likes: 0
Liked 3 Times in 3 Posts
being in a tall gear exiting a corner is a sure way to get shelled in a race or spirited group ride.
pdedes is offline  
Old 02-13-15, 09:45 PM
  #32  
Senior Member
 
Join Date: Aug 2013
Location: Long Beach, CA
Posts: 516

Bikes: 2016 Fuji SL

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 69 Post(s)
Likes: 0
Liked 1 Time in 1 Post
I think this is the issue: With an automobile, when one downshifts, the motor's RPM rises to match the wheelspeed of the car. Engine braking happens with downshifting with an automobile and not a cyclist because: 1. (obviously) roadbikes use freewheels/freehubs 2. when shifting into a lower gear and lifting off the throttle, the wheels are still spinning the crankshaft, but since no fuel and spark (not sure about the spark) are not being fed into the cylinder, the pistons are compressing the air in there and the increased resistance that the pistons face eventually slows down the crankshaft, which then slows down the wheels. Since a cyclist's legs don't have to deal with increased resistance when downshifting (due to freewheeling and the lack of an increasing resistant force), then it should make sense as to why it seems that a bicycle and an automobile work dissimilarly in this situation.
lyrictenor1 is offline  
Old 02-13-15, 10:21 PM
  #33  
Senior Member
 
spdracr39's Avatar
 
Join Date: Feb 2014
Location: Cabot, Arkansas
Posts: 1,538

Bikes: Lynskey Twisted Helix Di2 Ti, 1987 Orbea steel single speed/fixie, Orbea Avant M30, Trek Fuel EX9.8 29, Trek Madone 5 series, Specialized Epic Carbon Comp 29er, Trek 7.1F

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Likes: 0
Liked 1 Time in 1 Post
If you want to slow down stop pedalling. If you are compelled to pedal just soft pedal in the same gear don't shift at all.
spdracr39 is offline  
Old 02-13-15, 10:41 PM
  #34  
Senior Member
 
caloso's Avatar
 
Join Date: Jul 2002
Location: Sacramento, California, USA
Posts: 40,865

Bikes: Specialized Tarmac, Canyon Exceed, Specialized Transition, Ellsworth Roots, Ridley Excalibur

Mentioned: 68 Post(s)
Tagged: 0 Thread(s)
Quoted: 2952 Post(s)
Liked 3,106 Times in 1,417 Posts
Or get a fixed gear. Backpedal to your heart's content.
caloso is offline  
Old 02-13-15, 11:15 PM
  #35  
Senior Member
 
Join Date: Sep 2007
Posts: 336
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
This is awesome. Someone found a new way to how you Americans say, "get your cheese curdled"!
blarnie is offline  
Old 02-14-15, 01:14 AM
  #36  
Blamester
 
Join Date: Dec 2011
Location: Ireland
Posts: 1,045

Bikes: Peugeot teamline

Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 264 Post(s)
Liked 122 Times in 101 Posts
Whats so difficult for you guys to understand?
He feathered the brakes and pedalled against them as he was coming to a stop.
And that felt right for him at the time.
Thats all there is to it. No need to make out like he is a fool.
blamester is offline  
Old 02-14-15, 01:53 AM
  #37  
Senior Member
 
Join Date: Jun 2008
Location: Vancouver, BC
Posts: 9,201
Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 1186 Post(s)
Liked 289 Times in 177 Posts
Originally Posted by blamester
Whats so difficult for you guys to understand?
He feathered the brakes and pedalled against them as he was coming to a stop.
And that felt right for him at the time.
Thats all there is to it. No need to make out like he is a fool.
I suppose it could feel fine but it's pointless, particularly when he's shifting up as well. The discussion of increased control and engine braking added further confusion.
gregf83 is offline  
Old 02-14-15, 08:03 AM
  #38  
Senior Member
Thread Starter
 
kbarch's Avatar
 
Join Date: Aug 2014
Posts: 4,286
Mentioned: 21 Post(s)
Tagged: 0 Thread(s)
Quoted: 1096 Post(s)
Likes: 0
Liked 1 Time in 1 Post
OK, sorry about the confused analogy, but I can't help but think: legs = engine. By "engine braking" here, I meant slowing down without neutralizing or loosening the connections between the engine (ones legs) and the road under the drive wheel, which happens to be a necessary condition of proper engine braking. I should have also emphasized that this was just a brief sort of finessing, combined with other responses to a need to slow down or stop when pedaling at the high end of cadence abilities.

Last edited by kbarch; 02-14-15 at 08:07 AM.
kbarch is offline  
Old 02-14-15, 02:41 PM
  #39  
Senior Member
 
Join Date: Aug 2013
Location: Long Beach, CA
Posts: 516

Bikes: 2016 Fuji SL

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 69 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Originally Posted by kbarch
OK, sorry about the confused analogy, but I can't help but think: legs = engine. By "engine braking" here, I meant slowing down without neutralizing or loosening the connections between the engine (ones legs) and the road under the drive wheel, which happens to be a necessary condition of proper engine braking. I should have also emphasized that this was just a brief sort of finessing, combined with other responses to a need to slow down or stop when pedaling at the high end of cadence abilities.
Did you read my post in #32 ?
lyrictenor1 is offline  
Old 02-14-15, 03:23 PM
  #40  
Senior Member
 
Join Date: Jul 2012
Location: Canada, PG BC
Posts: 3,849

Bikes: 27 speed ORYX with over 39,000Kms on it and another 14,000KMs with a BionX E-Assist on it

Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 1024 Post(s)
Liked 57 Times in 49 Posts
My bike has a real "engine brake". All I have to do is put it in re-gen mode and it slows down the bike quite well...

Last edited by 350htrr; 02-14-15 at 03:27 PM. Reason: spelling
350htrr is offline  
Old 02-14-15, 06:46 PM
  #41  
Senior Member
Thread Starter
 
kbarch's Avatar
 
Join Date: Aug 2014
Posts: 4,286
Mentioned: 21 Post(s)
Tagged: 0 Thread(s)
Quoted: 1096 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Originally Posted by lyrictenor1
Did you read my post in #32 ?
Yes, thanks. Having been a motorcyclist, and my last two cars having been standards, I know. We also know that if you ride the clutch, it doesn't work - one can freewheel in a motor vehicle, too. Of course, on a bicycle it's normal, but it's not a good idea to ride a car that way - "ride," because you can only steer, not drive, when you're in neutral.

The faster you're going, the more dangerous it becomes to "ride" a car. So this gets me to thinking that the faster one is going as a bicyclist, the more worthwhile it might be to consider "driving" the bike.
kbarch is offline  
Old 02-14-15, 06:57 PM
  #42  
Senior Member
 
caloso's Avatar
 
Join Date: Jul 2002
Location: Sacramento, California, USA
Posts: 40,865

Bikes: Specialized Tarmac, Canyon Exceed, Specialized Transition, Ellsworth Roots, Ridley Excalibur

Mentioned: 68 Post(s)
Tagged: 0 Thread(s)
Quoted: 2952 Post(s)
Liked 3,106 Times in 1,417 Posts
Originally Posted by kbarch
OK, sorry about the confused analogy, but I can't help but think: legs = engine. By "engine braking" here, I meant slowing down without neutralizing or loosening the connections between the engine (ones legs) and the road under the drive wheel, which happens to be a necessary condition of proper engine braking. I should have also emphasized that this was just a brief sort of finessing, combined with other responses to a need to slow down or stop when pedaling at the high end of cadence abilities.
I think the term you're looking for is "soft pedaling."
caloso is offline  
Old 02-14-15, 07:02 PM
  #43  
~>~
 
Join Date: Mar 2013
Location: TX Hill Country
Posts: 5,931
Mentioned: 87 Post(s)
Tagged: 0 Thread(s)
Quoted: 1112 Post(s)
Liked 180 Times in 119 Posts
Originally Posted by kbarch
So this gets me to thinking that the faster one is going as a bicyclist, the more worthwhile it might be to consider "driving" the bike.
Congratulations: You are digging this hole ever deeper into a realm of analogy surpassing sheer utter nonsense.
Good work!

-Bandera
Bandera is offline  
Old 02-14-15, 07:07 PM
  #44  
THE STUFFED
 
Leukybear's Avatar
 
Join Date: Oct 2009
Location: San Francisco, CA
Posts: 12,671

Bikes: R. Sachs Road; EAI Bareknuckle; S-Works Enduro

Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 361 Post(s)
Likes: 0
Liked 20 Times in 17 Posts
Brake pads are cheaper then engine/ tranny parts in either scenario mechanical or bodily.
__________________
¿pɐǝɹ oʇ sᴉ sᴉɥʇ ƃuᴉʎouuɐ ʍoɥ ǝǝs

Originally Posted by veganbikes
Pound sign: Kilo TT
Leukybear is offline  
Old 02-14-15, 07:23 PM
  #45  
Senior Member
Thread Starter
 
kbarch's Avatar
 
Join Date: Aug 2014
Posts: 4,286
Mentioned: 21 Post(s)
Tagged: 0 Thread(s)
Quoted: 1096 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Originally Posted by caloso
I think the term you're looking for is "soft pedaling."
Maybe. But I wanted to avoid using that expression because it seems it doesn't matter if there's still some freewheeling going on while soft pedaling.
kbarch is offline  
Old 02-14-15, 07:44 PM
  #46  
Senior Member
 
Join Date: Nov 2008
Location: Bay Area, Calif.
Posts: 7,239
Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 659 Post(s)
Likes: 0
Liked 7 Times in 6 Posts
Originally Posted by Leukybear
Brake pads are cheaper then engine/ tranny parts in either scenario mechanical or bodily.
That may be true, but they all tend to be cheap compared to surgical and/or funeral costs which might be incurred in mountainous terrain when engine braking is not employed and brakes overheat or the brake fluid boils. There's a reason for those emergency exit lanes with deep sand and barriers to slow vehicles that have lost braking power on mountain roads.
prathmann is offline  
Old 02-14-15, 07:50 PM
  #47  
THE STUFFED
 
Leukybear's Avatar
 
Join Date: Oct 2009
Location: San Francisco, CA
Posts: 12,671

Bikes: R. Sachs Road; EAI Bareknuckle; S-Works Enduro

Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 361 Post(s)
Likes: 0
Liked 20 Times in 17 Posts
Originally Posted by prathmann
That may be true, but they all tend to be cheap compared to surgical and/or funeral costs which might be incurred in mountainous terrain when engine braking is not employed and brakes overheat or the brake fluid boils. There's a reason for those emergency exit lanes with deep sand and barriers to slow vehicles that have lost braking power on mountain roads.
Well of course, I was speaking in a general sense without going into specifics.
That's pretty much a sunk cost if you choose to live in such an area though.

I once forgot to engine brake going down the sierra nevada once. I died.
Now my ghost looms these forums.
__________________
¿pɐǝɹ oʇ sᴉ sᴉɥʇ ƃuᴉʎouuɐ ʍoɥ ǝǝs

Originally Posted by veganbikes
Pound sign: Kilo TT
Leukybear is offline  
Old 02-14-15, 07:55 PM
  #48  
~>~
 
Join Date: Mar 2013
Location: TX Hill Country
Posts: 5,931
Mentioned: 87 Post(s)
Tagged: 0 Thread(s)
Quoted: 1112 Post(s)
Liked 180 Times in 119 Posts
Originally Posted by prathmann
There's a reason for those emergency exit lanes with deep sand and barriers to slow vehicles that have lost braking power on mountain roads.
The OP lives in NYC, and he rides a bicycle.
He can always hit a pedestrian to slow down if "engine braking" fails , no need for deep sand barriers in Central Park.

-Bandera
Bandera is offline  
Old 02-14-15, 09:19 PM
  #49  
Senior Member
Thread Starter
 
kbarch's Avatar
 
Join Date: Aug 2014
Posts: 4,286
Mentioned: 21 Post(s)
Tagged: 0 Thread(s)
Quoted: 1096 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Originally Posted by Leukybear
Brake pads are cheaper then engine/ tranny parts in either scenario mechanical or bodily.
Brakes are an accessory, a necessary evil at best. Maybe I should get a fixie.
Just kidding - I love my brakes, I love my freewheel, and I use them lots. My knees are especially fond of them.
kbarch is offline  
Old 02-15-15, 07:38 AM
  #50  
~>~
 
Join Date: Mar 2013
Location: TX Hill Country
Posts: 5,931
Mentioned: 87 Post(s)
Tagged: 0 Thread(s)
Quoted: 1112 Post(s)
Liked 180 Times in 119 Posts
Originally Posted by kbarch
Maybe I should get a fixie.
Better yet, in all seriousness, take advantage of the fact you have a local velodrome.
There is no better way to learn the proper techniques of cycling than in the controlled environment of the track with experienced coaches at hand.

Show up, rent a bike and take part in the "new rider's" program.
All theories about pedaling technique, handling and drafting evaporate on the reality of the banking, real skills useful on the road replace idle conjecture.

-Bandera
Bandera is offline  


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.