Welcome, Guest. Please Login.
rbent - Recumbent Bike Enthusiasts of North Texas
Nov 19th, 2024, 12:44am
News: Want to join the rbent Forum? See this thread.
Home Help Search Login


Pages: 1 2 
Send Topic Print
shifting gears (Read 2343 times)
larry




rbent member

Posts: 35
shifting gears
May 4th, 2009, 9:55pm
 
Here is  another dumb question from a newbie recumbent rider. I have a 24 speed Sun EZ-1 SX. Three gears at the front with the pedals and 8 gears on the back wheel. I ride to work over a set of easy rolling hills, along Bowen from Sublett to Mayfield in Arlington. Normally I keep the front gear on the middle and just use the back ones,  6 or 7 of them on most days.
 
So what is the optimum pattern for using the gears?  When would I do well to switch the front gear? Thanks for enlightening me!
Larry Smiley
Back to top
 
« Last Edit: May 4th, 2009, 9:57pm by larry »  
  IP Logged
FlyingLaZBoy
Moderator
*****


'16 ICE SprintX fs,
'16 Rocket, '12 KHS
Mocha

Posts: 5803
Re: shifting gears
Reply #1 - May 5th, 2009, 9:51am
 
Quote from larry on May 4th, 2009, 9:55pm:
... I ride to work over a set of easy rolling hills, along Bowen from Sublett to Mayfield in Arlington. Normally I keep the front gear on the middle and just use the back ones,  6 or 7 of them on most days.

So what is the optimum pattern for using the gears?  When would I do well to switch the front gear?
Larry Smiley

 
May I suggest that there isn't an "optimum pattern" as such, simply because it's dependent upon the terrain your encountering at the time, and your particular ability to keep the pedals spinning...  But for the situation you describe, you're doing the right thing by staying in the middle ring!  If you can keep your pedal rotation up and avoid "mashing" too much, you're fine.  I have an EZ1, and the 20" wheels naturally give you a somewhat lower "gear-inch" range for climbing, although the bike is heavy.
 
The "cross-chain" wear issue, where you're in the gear extremes (big ring up front, big ring in back, or vice versa) is really more of a problem on DF bikes, with their "standard length" chain -- there is about 18" of center-to-center distance between front and back gears on a DF, but you've got almost 2.5 X that distance, so the relative angle of the chain is reduced.
 
If, while climbing, you find yourself staying in the largest rear gears for what seems to be a significant amount of time, and you occasionally have to mash at the low end while climbing, feel free to shift into the "granny" gear up front for that section -- you'll essentially gain an extra two lower gears (just watch that your chain doesn't drop off the gear to the inside -- check your derailleur limit screw setting).  And same with the opposite scenario -- if you're always in 7 or 8 on a flat or downhill section, shift to the big ring if you like!  But personally, I wouldn't worry too much about "optimum" or cross-chaining wear...
 
It's really a personal preference, tied to how adept you feel at shifting the front chainring -- because to shift to the granny while climbing requires you to slightly reduce your pedaling pressure to allow the chain to release from the larger gear.  So stay in the middle ring, and be happy!   Smiley
Back to top
 
 

******************
"A hundred miles on a bike? How many
days does that take you?"

******************
Email FlyingLaZBoy   IP Logged
shellenefoster




rbent member

Posts: 100
Re: shifting gears
Reply #2 - May 5th, 2009, 10:12am
 
When I started riding, I was pretty clueless.  Now I'm just less clueless  Smiley.  Things I have learned:
 
The gears on the front are typically refered to as "Chain rings", and the gears on the rear "Cogs".  The df guys call 3 chainrings on the front a "triple".
 
As for shifting, I have found that as a newbie, living in the middle chain ring is not that bad as long as you are riding on gentle terrain.  As a general rule, you want to focus on your cadence for shifting purposes.  If you find that your feet are going around really slowly, your leg muscles are starting to hurt,and you are out of cogs, that's the time to shift into the "little" chainring.  If you find that you are spinning your feet as fast as possible, you are not feeling any force on the pedals, and you are out of cogs, that's the time to shift into the "big" chainring.  So, if you know an upcoming hill is going to hurt, at some point, shift down to the little chainring and spin your feet faster (higher cadence) so that it hurts less.  When I shift down to the little chainring, I simultaneously shift "up" one cog so that my cadence is not so greatly changed.  This all takes a little experience to get the feel of it, and you should start experimenting with your chainrings now so that when you need them you are certain to do the right thing.
 
I'm pretty sure the guys can give better advice, and I am looking forward to reading their responses.
Shellene
Back to top
 
 
  IP Logged
FlyingLaZBoy
Moderator
*****


'16 ICE SprintX fs,
'16 Rocket, '12 KHS
Mocha

Posts: 5803
Re: shifting gears
Reply #3 - May 5th, 2009, 11:02am
 
You've got it, Shellene....
 
Here's a drawing I put together a while back, comparing the EZ1 chainline to a DF bike...  Again, the primary concern, as such, with "cross-chaining" is wear of the gear teeth and chain links due to friction from being out of line, and (very) minor effects from loss of power.  You can see that, on most 'bents, cross-chaining ain't no big thang compared to a DF chainline, because the angle is significantly reduced....  But in general, it's still a sound idea to avoid the maximum gearing opposites of "granny/11T" and "BigRing/32T"... (but not critical)
 

 
Also, trigonometrically and statically speaking, on a DF you lose about 0.12% of your power transmission strictly due to the angle of the chain (excluding friction components) when you're at gear extremes -- but with 42" between your front and rear gears, it is about 0.02%  (if I've done the math right, Shellene?)...  So as I said, "It ain't no thang..."   Smiley
Back to top
 
« Last Edit: May 5th, 2009, 11:15am by FlyingLaZBoy »  

******************
"A hundred miles on a bike? How many
days does that take you?"

******************
Email FlyingLaZBoy   IP Logged
Bud_Bent
Moderator
*****




Posts: 3311
Re: shifting gears
Reply #4 - May 5th, 2009, 11:19am
 
Quote from shellenefoster on May 5th, 2009, 10:12am:

I'm pretty sure the guys can give better advice, and I am looking forward to reading their responses.
Shellene

 
Actually, that was very good explanation, Shellene. I'm not sure I could have said it that well.
 
Larry, if you want lots of technical info, you can find it on Sheldon Brown's shifting page, but Shellene summed up the practical part of it well.
Back to top
 
« Last Edit: May 5th, 2009, 11:24am by FlyingLaZBoy »  

Bud
* 2009 RANS F-5 Pro
* 2009 RANS XStream
* 2004 RANS Screamer
My Blog - uneasy-rider.com
WWW   IP Logged
Kwijybow
Five Star Member
*****


mostly a commuter

Posts: 1026
Re: shifting gears
Reply #5 - May 5th, 2009, 1:21pm
 
I know when I push the lever one way it gets easier, and the other way it gets harder, except on the bikes I have no lever, then it just just gets easier and harder.  Wink
Back to top
 
 

Commuter 1Cheesyavidson Impulse
Commuter 2: Motobecane Fixie
Commuter 3: Salsa Journeyman
Recumbent 1: Schlitter Encore 20
recumbent 2: Bacchetta Ti Aero
Email   IP Logged
evblazer
Five Star Member
*****


Restricted from
Riding Long Distance
or Hills

Posts: 908
Re: shifting gears
Reply #6 - May 5th, 2009, 3:24pm
 
If I had a triple I'd be riding in the middle chainring all day except when it was flat or downhill and I was trying to sprint. As it is I just have a double so I'm in the smaller of my rings all day so what you are doing in the terrain you describe doesn't seem off.  Eventually you might find you run out of gearing on the downhill portion of the rolling hills and then you could put it in the big chainring but many times I'll just pedal to keep my legs moving and wait the few seconds for it to flatten out and climb to begin yet again instead of shifting for a few seconds.
 
There are definately a few hills with the weight i'm pulling, not just the bike, that it might be nice to have a little bit easier gearing that a triple chainring or a larger cassette in back would offer but I've gotten by so far with only one or two walks after very long days.
 
Nelson the worst for me is when I switch between my road bike and my touring bike. On one I push the little lever to get easier on the other I push the big lever to get easier. I always forget that till I'm towing a full load of groceries and think I'm shifting one way as I stop at a light  embarrassed
Back to top
 
« Last Edit: May 5th, 2009, 3:25pm by evblazer »  

Mark Hastings
Hurricane & Oregon - Need to lose weight to ride, I hate my new meds Sad
Merlin Road - Short distance speed bike
Fuji Touring Xtracycle Shopping Hauler Bike
  IP Logged
aikigreg
Moderator
*****


recumbent ninja

Posts: 3685
Re: shifting gears
Reply #7 - May 5th, 2009, 3:55pm
 
Yeah it kinda ends being individual by feel.  
 
Here's how I used to do it when learning:
 if I have 9 cogs in the back and 3 in the front.  I did it this way:
downhills - big ring in froint, small 3 cogs in back
flats - middle ring in front, middle 3 cogs in back
uphills - small in front, big 3 cogs in back
 
But I now do it all by feel, based on what I know my body likes.
Back to top
 
 

I'm in it to Schwinn it.
Email   IP Logged
FlyingLaZBoy
Moderator
*****


'16 ICE SprintX fs,
'16 Rocket, '12 KHS
Mocha

Posts: 5803
Re: shifting gears
Reply #8 - May 5th, 2009, 7:07pm
 
Quote from shellenefoster on May 5th, 2009, 10:12am:
When I started riding, I was pretty clueless.  Now I'm just less clueless  Smiley.  
Shellene

 
 
Perhaps, but still pretty...   Cool
Back to top
 
 

******************
"A hundred miles on a bike? How many
days does that take you?"

******************
Email FlyingLaZBoy   IP Logged
FlyingLaZBoy
Moderator
*****


'16 ICE SprintX fs,
'16 Rocket, '12 KHS
Mocha

Posts: 5803
Re: shifting gears
Reply #9 - May 5th, 2009, 7:11pm
 
Quote from evblazer on May 5th, 2009, 3:24pm:
.... I'll just pedal to keep my legs moving and wait the few seconds for it to flatten out and the climb to begin yet again....

 
 
And, Lord help us, this always does seem to be the case!!!!   Smiley Smiley
Back to top
 
 

******************
"A hundred miles on a bike? How many
days does that take you?"

******************
Email FlyingLaZBoy   IP Logged
larry




rbent member

Posts: 35
Re: shifting gears
Reply #10 - May 5th, 2009, 10:26pm
 
Thanks guys, and Shellene. This is really helpful input. Your patience with the dumb questions is exemplary! On another note,  SmileyRiding a recumbent really draws attention doesn't it? Most of the time it is positive....
Back to top
 
 
  IP Logged
shellenefoster




rbent member

Posts: 100
Re: shifting gears
Reply #11 - May 6th, 2009, 6:52am
 
Quote from FlyingLaZBoy on May 5th, 2009, 11:02am:
Here's a drawing I put together a while back

 
Excellent diagram!  Thanks for sharing Smiley
Shellene
Back to top
 
 
  IP Logged
FlyingLaZBoy
Moderator
*****


'16 ICE SprintX fs,
'16 Rocket, '12 KHS
Mocha

Posts: 5803
Re: shifting gears
Reply #12 - May 6th, 2009, 10:32am
 
Quote from larry on May 5th, 2009, 10:26pm:
Thanks guys, and Shellene. This is really helpful input. Your patience with the dumb questions is exemplary! On another note,  SmileyRiding a recumbent really draws attention doesn't it? Most of the time it is positive....

 
 
It's not a dumb question at all, simply a common one for relatively new riders to ask!
 
And yes, it's hard to be an introvert on a 'bent....  at least work on your "Queen's hand wave and nod" technique...  Cheesy
Back to top
 
 

******************
"A hundred miles on a bike? How many
days does that take you?"

******************
Email FlyingLaZBoy   IP Logged
evblazer
Five Star Member
*****


Restricted from
Riding Long Distance
or Hills

Posts: 908
Re: shifting gears
Reply #13 - May 6th, 2009, 10:52am
 
Quote from FlyingLaZBoy on May 6th, 2009, 10:32am:
And yes, it's hard to be an introvert on a 'bent....  at least work on your "Queen's hand wave and nod" technique...  Cheesy

Hmm.. Maybe that is the real reason I like the Hurricane. It is too low to really talk to anyone so I can just give a little wave or nod and never have to talk to any other cyclists, at least non-recumbent ones Smiley
 
But yeah beware of where you stop and plan your time accordingly sometimes when I lockup I get alot of attention and questions which can hold up my schedule when I'm running errands or getting my wife lunch.
Back to top
 
« Last Edit: May 6th, 2009, 10:53am by evblazer »  

Mark Hastings
Hurricane & Oregon - Need to lose weight to ride, I hate my new meds Sad
Merlin Road - Short distance speed bike
Fuji Touring Xtracycle Shopping Hauler Bike
  IP Logged
irodguy




rbent member

Posts: 260
Re: shifting gears
Reply #14 - May 6th, 2009, 3:40pm
 
Well there is another reason to have a "low racer" style bike.  I was being following (a bit to closely) by a fellow in Florida and had to stop for a car.  He could not unclip fast enough and went down.  He was so low that he suffered no damage and was perfectly okay.  On a Strada he likely would have been road kill.
Back to top
 
 

2008 Rans V-Rex
2009 Rans X-stream
2008 Bacchetta Strada
2008 Catrike Expedition Neon Lime Green
Email   IP Logged
Pages: 1 2 
Send Topic Print