Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

User Tag List

Reply
 
Thread Tools Search this Thread
Old 03-22-11, 08:16 PM   #1
Royceg
Junior Member
Thread Starter
 
Join Date: Mar 2011
Location: Guam
Bikes: Raleigh Rush Hour
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
44/16 vs 46/17 fixed ratio question

So I'm running 44/16 w a GI of 74.3

Two friends are running 46/17 w a GI of 73.1

Why is skidding more difficult w my bike. The frame geometry seems identical to theirs. Could the crank arm length be an issue?

Was thinking of swapping out the rear cog for a 19t. Is this ok? Lowering my GI to 62.5.

(FYI I've been a singlespeed commuter since I was in college. I now ride for fun and have started using the fixed side of my flipflop hub.)
Royceg is offline   Reply With Quote
Old 03-22-11, 08:19 PM   #2
91MF
i'll probably break it
 
91MF's Avatar
 
Join Date: Jun 2008
Bikes:
Posts: 1,671
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
http://www.bikeforums.net/showthread...imer-for-Newbs

uncle sixty loves you
91MF is offline   Reply With Quote
Old 03-22-11, 08:38 PM   #3
Royceg
Junior Member
Thread Starter
 
Join Date: Mar 2011
Location: Guam
Bikes: Raleigh Rush Hour
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
haha thanks unk.

I tried to do SOME searching before i posted.

I just don't understand why such a small difference in GI feels like a big difference. So a good ball park for GI is 69-72 I assume? Choosing which ever has a good amount of skid patches?
Royceg is offline   Reply With Quote
Old 03-22-11, 08:49 PM   #4
FastJake
Constant tinkerer
 
FastJake's Avatar
 
Join Date: May 2010
Location: Madison, Wisconsin
Bikes:
Posts: 7,577
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Same pedal system? It's easier to skid if you crank up the pressure in your rear tire. The difference in gear inches is basically meaningless between your bike and your friends.
FastJake is offline   Reply With Quote
Old 03-22-11, 08:50 PM   #5
cc700
Ths Hipstr Kills Masheenz
 
cc700's Avatar
 
Join Date: Oct 2006
Location: seattle
Bikes: tirove
Posts: 8,543
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
i like 46/17 tons, and that's in hilly ****ing seattle.
cc700 is offline   Reply With Quote
Old 03-22-11, 09:10 PM   #6
Royceg
Junior Member
Thread Starter
 
Join Date: Mar 2011
Location: Guam
Bikes: Raleigh Rush Hour
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I dig the 46/17 ratio. Easy to skid. But the GI is so close to my 44/16 yet it's ridiculously harder to skid. Weird.

As I've read the crank arm length doesn't matter.

I ride in tropically hot weather. Bike pressure is up at 120psi so I'm sure it's not that.

Is 44/19 too easy to stop? I'm about to order a new rear cog. 17/18/19 ? Any input.
Royceg is offline   Reply With Quote
Old 03-22-11, 09:13 PM   #7
FastJake
Constant tinkerer
 
FastJake's Avatar
 
Join Date: May 2010
Location: Madison, Wisconsin
Bikes:
Posts: 7,577
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Crank length definitely matters. Longer cranks = more leverage, but might limit how fast you can spin.

How do you like your current ratio when you're actually riding? That matters more than how easy it is to skid..
FastJake is offline   Reply With Quote
Old 03-22-11, 09:52 PM   #8
Royceg
Junior Member
Thread Starter
 
Join Date: Mar 2011
Location: Guam
Bikes: Raleigh Rush Hour
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
The ride is fine I suppose. I don't have much to base it off of. I get up small hills fairly easily. Bigger hills require me to have a decent lead in.

My main goal was to ride brakeless.

I don't commute anymore. The bike is just for leisure. Tricks
Royceg is offline   Reply With Quote
Old 03-22-11, 11:12 PM   #9
FastJake
Constant tinkerer
 
FastJake's Avatar
 
Join Date: May 2010
Location: Madison, Wisconsin
Bikes:
Posts: 7,577
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Quote:
Originally Posted by Royceg View Post
I don't commute anymore. The bike is just for leisure. Tricks
In that case, go as low as you want. 19 or 20T should do it.
FastJake is offline   Reply With Quote
Old 03-22-11, 11:24 PM   #10
Sixty Fiver
Bicycle Repair Man !!!
 
Sixty Fiver's Avatar
 
Join Date: Sep 2007
Location: YEG
Bikes: See my sig...
Posts: 27,264
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
Being that you just started riding fixed i am gonna say that your ability to skid, or lack thereof is probably due to technique and not because you are running a marginally taller gear.

Until you perfect your mad skidding skilz do keep running a brake and then... leave it there.

You can read "Braking 101" after you study up on gearing.

Your Uncle Sixty.
Sixty Fiver is offline   Reply With Quote
Old 03-23-11, 12:22 AM   #11
molimo140
Senior Member
 
Join Date: Dec 2010
Bikes:
Posts: 65
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Skidding is all about technique. If you want to skid while still in the saddle then you're gonna need lower gear inches, but in general it's about technique.

Just make sure you have good foot retention and remember to pull up on your other leg as you push down with your stronger one!
molimo140 is offline   Reply With Quote
Old 03-23-11, 03:38 AM   #12
avner
Fueled by Tigers Blood
 
avner's Avatar
 
Join Date: May 2010
Location: Echo Park, California
Bikes:
Posts: 1,484
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
tonight I learned how to skid without SPD clips
avner is offline   Reply With Quote
Old 03-23-11, 03:43 AM   #13
docboyd
Senior Member
 
docboyd's Avatar
 
Join Date: Jan 2011
Location: Riverside/Temecula, CA
Bikes:
Posts: 493
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
i learned it without foot retention cause i'm dumb so now its nice and easy...it totally matters about technique more than anything else tho
docboyd is offline   Reply With Quote
Old 03-23-11, 07:13 PM   #14
Royceg
Junior Member
Thread Starter
 
Join Date: Mar 2011
Location: Guam
Bikes: Raleigh Rush Hour
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Hey thanks guys for the advice. Much obliged. I will be running a break until I get comfy with the tech as suggested.

I was just curious about the ratios bc 74.3 vs 73.1 didn't seem like much of a spread in terms of GI. Yet I can skid much easier on the 73.1.

Anyhow I'll be picking up a 17t and a 19t to give it a go.
Royceg is offline   Reply With Quote
Old 03-23-11, 07:14 PM   #15
avner
Fueled by Tigers Blood
 
avner's Avatar
 
Join Date: May 2010
Location: Echo Park, California
Bikes:
Posts: 1,484
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
i strongly suggest running a brake forever.

Although those who do run brakeless have told me that 5+ years of riding fixed was the point they stopped using a brake.
avner is offline   Reply With Quote
Old 03-23-11, 07:20 PM   #16
lvleph
Should be out Riding
 
Join Date: Dec 2006
Location: Blacksburg, VA
Bikes: Bob Jackson Vigorelli
Posts: 1,902
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Take into account the number of skid patches. I would suggest 17t or 19t rear cog, because they are going to maximize the number of skid patches for a 46t chain ring.
lvleph is offline   Reply With Quote
Old 03-23-11, 11:59 PM   #17
bike manhattan
Senior Member
 
bike manhattan's Avatar
 
Join Date: Jun 2008
Location: Philadelphia, PA
Bikes:
Posts: 199
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
48/17 for life
bike manhattan is offline   Reply With Quote
Old 03-24-11, 12:01 AM   #18
Squirrelli
GONE~
 
Join Date: Apr 2010
Bikes:
Posts: 6,749
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Royceg View Post
Anyhow I'll be picking up a 17t and a 19t to give it a go.
44/17 is a good ratio, so versatile.

Or the 47/18, same gear inches, but looks bigger than 44/17. The teeth of both chainring and cog doesn't need to carry that much load on a smaller sized ratio.
Squirrelli is offline   Reply With Quote
Old 03-24-11, 07:36 PM   #19
martinus
Senior Member
 
martinus's Avatar
 
Join Date: Dec 2008
Bikes:
Posts: 939
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Are you saying you can tell/feel the difference of ~1 GI ?

... totally believable.

.
.
.
martinus is offline   Reply With Quote
Old 03-24-11, 07:55 PM   #20
docboyd
Senior Member
 
docboyd's Avatar
 
Join Date: Jan 2011
Location: Riverside/Temecula, CA
Bikes:
Posts: 493
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
just go 52/19 like me...you look awesome and have less chainwear but its just as easy as 46/17
though i must say finding a 46 is much easier than a 52
docboyd is offline   Reply With Quote
Old 03-24-11, 09:04 PM   #21
jdgesus 
sɹɐʇsɟoןןnɟsʇıbɟɯo
 
jdgesus's Avatar
 
Join Date: Oct 2010
Location: seattle, too many links
Bikes: fixed gear recumbent trike
Posts: 3,986
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Squirrelli View Post
44/17 is a good ratio, so versatile.

Or the 47/18, same gear inches, but looks bigger than 44/17. The teeth of both chainring and cog doesn't need to carry that much load on a smaller sized ratio.

one of my bikes is 49/19 and the other 44/17
the 44/17 feels much more responsive even tho they are pretty much the same ratio.

torque?!
__________________
Quote:
Originally Posted by yummygooey View Post
crabon/campy/rapha/roadie-bro.

next step is recumbent.




my bikes | bike blog | beer blog | work 1 | work 2
jdgesus is offline   Reply With Quote
Old 03-25-11, 03:59 PM   #22
eoLithic
Junior Member
 
Join Date: Mar 2011
Bikes:
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
learning to skid on the lowest practical ratio is highly recommended. i learned and stuck w/ 42x16. approx 70gi if i recall. i ran many different gears. anything above 70gi requires holding torque and strength to skid and keep skidding. why ppl ride a bigger gear than 70gi is beyond me, especially brakeless.. super pointless... and a quick way to to T bone someone ... ppl who ride bigger gears are slow.. uphill, short downhills, flat, in traffic, off the line.. and take forever to stop.

a lot of people neglect their rear tire.. if you're running a 28c rando or whatever... skidding is gonna be beyond tough, especially if you're learning. fat tires weigh more, grip better, and are usually a bit taller... which also ups your gear inches.

get urself a nice 700x23. like a michelin pro3 race.. skids quite easily.. same w/ vitoria rubinos, and just about any high end tire w/ harder rubber down the center

also... road geometry is actually easier to skid on than a track bike. to a degree.. being that a track bike's rear wheel sits further under you than a road/touring frame does... for instance, did u kno a schwinn stingway is a wheelie monster? doesn't look it, but it is...

also... understand skidding is 90% technique, 10% strength. and majority of that strength comes from your front foot RESISTING the natural motion of the pedals. keyword.. resisting.. not PULLING UP... or PUSHING back w/ your rear foot. in short.. lock your ankles. and the rest will fall in place...

hope this helps

and whomever said crankarm length doesn't matter.. c'mon now... try turning a boat w/ a steering wheel the size of your car's. simple lever

Last edited by eoLithic; 03-25-11 at 04:07 PM.
eoLithic is offline   Reply With Quote
Old 03-25-11, 04:17 PM   #23
iBgearLess
Senior Member
 
iBgearLess's Avatar
 
Join Date: Dec 2010
Location: San Diego, CA
Bikes: Surly Steamroller
Posts: 190
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Keep your brake on!
iBgearLess is offline   Reply With Quote
Old 03-25-11, 04:35 PM   #24
CaptainCool
``````````````
 
CaptainCool's Avatar
 
Join Date: Feb 2007
Location: san jose
Bikes:
Posts: 763
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by jdgesus View Post
one of my bikes is 49/19 and the other 44/17
the 44/17 feels much more responsive even tho they are pretty much the same ratio.

torque?!
Confirmation bias.
CaptainCool is offline   Reply With Quote
Old 03-25-11, 05:31 PM   #25
yummygooey
i smell bacon
 
yummygooey's Avatar
 
Join Date: Mar 2010
Bikes: Geekhouse Deerfield, GT Edge Ti, Spooky Skeletor, TET Track, Ritchey P-650b, Bridgestone MB-3
Posts: 5,574
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
44x17 has been my favorite ratio so far. Sooooo smooth.
yummygooey is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 02:46 PM.