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


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 11-14-04, 05:23 PM   #1
MATTO
Senior Member
Thread Starter
 
Join Date: Nov 2004
Bikes:
Posts: 106
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Gear Ratios, how do they work?

Hi im interested in geting a knew cassest umm I saw that theres like 11/13 11/15 and stuff like that

would i get a knew chain with that 2 so they wear together



but can u explain to mean what the numbers mean.

thanks in advance
MATTO is offline   Reply With Quote
Old 11-14-04, 06:20 PM   #2
chris_krueger
Member
 
Join Date: Aug 2004
Bikes:
Posts: 42
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I believe the numbers are the number of teeth on the chain ring
chris_krueger is offline   Reply With Quote
Old 11-14-04, 06:53 PM   #3
phantomcow2
la vache fantôme
 
phantomcow2's Avatar
 
Join Date: Aug 2004
Location: NH
Bikes:
Posts: 6,266
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I can hardly understand your english, try making your message clear and use the right word. its new not knew. Where are you seeing these numbers?
phantomcow2 is offline   Reply With Quote
Old 11-14-04, 07:55 PM   #4
MATTO
Senior Member
Thread Starter
 
Join Date: Nov 2004
Bikes:
Posts: 106
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
sorry i have a habit of adding K to letters,

but it says when I would go to buy a Cassette(sp)
it is availibale int he following ratios
11/13................etc
MATTO is offline   Reply With Quote
Old 11-14-04, 08:43 PM   #5
twahl
Tom (ex)Builder
 
twahl's Avatar
 
Join Date: Jul 2004
Location: Manassas, VA
Bikes: Specialized Allez
Posts: 2,814
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Usually cassettes are listed by the smallest and largest cogs in the set. The smallest will be your fastest gear for a given RPM on a certain chain ring, and the largest will give you the most pulling power. Basically 1 revolution of the pedals goes further on the smallest gear, and gives the most power on the largest gear. Road bikes have closer ratio cassettes, and mountain bikes have more difference in the gears. For instance a road cassette might be anywhere from 11-21 to 12-27, and a mountian cassette might be anywhere from 11-32 to 11-34. Getting a new chain isn't a bad idea just because they do need to be replaced periodically anyway.
__________________
Tom

"It hurts so good..."
twahl is offline   Reply With Quote
Old 11-14-04, 08:43 PM   #6
531Aussie
Aluminium Crusader :-)
 
Join Date: Apr 2004
Location: Melbourne, Australia
Bikes:
Posts: 9,991
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
The numbers refer to the numbers of teeth on the rear cogs.

If you buy a 9 speed "11 to 21" cassette, the 9 cogs will
most have the following numbers of teeth on them: 11,12,13,14,15,16,17,19,21.

The smaller the number of teeth on the back cogs, the bigger/harder the gear,
and the smaller the number of teeth on the front chainring (near the pedals), the
easier the gear.

Some people think that an 11 tooth cog provides such a big gear that is
unnecessary, so they usually get a "12 to 23" cassette or even a 12 to 25, or even
higher.

In my opninion, it's preferable to buy a new chain at the same time
531Aussie is offline   Reply With Quote
Old 11-14-04, 09:19 PM   #7
Biketo120
Member
 
Join Date: Nov 2004
Bikes:
Posts: 26
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
For detailed info, here is a link to a site to download a software package that will calculate gear ratios:

http://www.machinehead-software.co.u...alculator.html
Biketo120 is offline   Reply With Quote
Old 11-14-04, 09:21 PM   #8
sydney
Senior Member
 
sydney's Avatar
 
Join Date: Jan 2004
Bikes:
Posts: 9,428
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by 531Aussie

In my opninion, it's preferable to buy a new chain at the same time
That's a potential waste of ALOT of money ,and that isn't an opinion.
sydney is offline   Reply With Quote
Old 11-14-04, 09:26 PM   #9
531Aussie
Aluminium Crusader :-)
 
Join Date: Apr 2004
Location: Melbourne, Australia
Bikes:
Posts: 9,991
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by sydney
That's a potential waste of ALOT of money ,and that isn't an opinion.
"ALOT" of money???!!! That's just hooey

Let's do a poll
531Aussie is offline   Reply With Quote
Old 11-14-04, 11:29 PM   #10
Hitchy
Senior Member
 
Join Date: Jun 2004
Location: Melbourne Oz
Bikes: how long have you got?
Posts: 2,397
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by 531Aussie
"ALOT" of money???!!! That's just hooey

Let's do a poll

theres no 'hooey' here is there.......???...thought it was just BS!....

hitchy
Hitchy is offline   Reply With Quote
Old 11-15-04, 07:56 AM   #11
Vittorio
al-majnoun ma'a daraaja
 
Join Date: Aug 2004
Location: Tunisia
Bikes: Specialized Crossroads Euro Elite '99, Masi Gran Corsa '02
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
No, new chain is not waste of "A LOT" money. Chain is wear item, as tyres or brake rubbers. Wear out, replace, repeat.

Answer to original question: Roadracing have small number cassettes, as 11/25, for best horsepower (manpower?) at high RPMs. Horsepower makes speed.

Hybrid & VTT have bigger numbers, as 13/32, for more torque. Torque makes ability to climb. All cassettes have ratios for to provide both, but compromise in favour of purpose for bicycle.

Best is to replace cassette with same numbers, thus u will not have any troubles with shifts. If now u have 11/25, purchase same. Too high last number, and rr derailleur pulley can crash to cassette.

Install new chain before is too late can prevent destruction on cassette. I report 2 000, 2 200km
before chain wear out, some tell me is normal, others no. Chi sa?

For chains, more expensive = less weight. If u can accept a few more g, u can purchase for less money.

Example, in Italia, Shimano XTR 9sp = 21€, and HG93 = 18€. I purchase Shimano HG53 (9sp) at 11€, five at one time. Extra weight of chain for me is not importante, for I have 10, 15 kg on rack, lights, tools, etc.

Just my opinions, good luck!
Vittorio is offline   Reply With Quote
Old 11-15-04, 05:27 PM   #12
MATTO
Senior Member
Thread Starter
 
Join Date: Nov 2004
Bikes:
Posts: 106
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
well im okay im 500m from the 2000mile mark on my bike. where I live i have moderate hills and flats what would be a good set up?

oh and I would get a chan so the cassette and the chain could wear evenly
MATTO is offline   Reply With Quote
Old 11-15-04, 07:47 PM   #13
Alphie
Right calf grease tattoo
 
Alphie's Avatar
 
Join Date: May 2004
Location: Alpharetta GA
Bikes: '02 Alpe D'Huez
Posts: 200
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I see that you have a Trek 1200. If it has a triple it has a 52/42/30 chainring and a 12/25 cassette. That is almost the same as on my Lemond, and that gearing is just fine for this area. My commuting route is mostly flat, but there are some hilly areas of Atlanta that make having the 30 ring nice.
Alphie is offline   Reply With Quote
Old 11-15-04, 07:56 PM   #14
MATTO
Senior Member
Thread Starter
 
Join Date: Nov 2004
Bikes:
Posts: 106
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
nice man, umm so would more torque= less straightaway speed but more speed up hill or?
MATTO is offline   Reply With Quote
Old 11-15-04, 08:15 PM   #15
John E
feros ferio
 
John E's Avatar
 
Join Date: Jul 2000
Location: www.ci.encinitas.ca.us
Bikes: 1959 Capo; 1980 Peugeot PKN-10; 1981 Bianchi; 1988 Schwinn KOM-10;
Posts: 17,307
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 139 Post(s)
Quote:
Originally Posted by MATTO
nice man, umm so would more torque= less straightaway speed but more speed up hill or?
Changing gears lets you trade torque against road speed. You use the larger rear cogs and/or smaller front chainrings to creep up hills without damaging your knees, and you use the high gears (small cogs / large chainrings) to go fast with the wind or downhill. Since I am one of those who feels strongly that 11- or 12-tooth cogs are useless with any chainring larger than 48T, most of my rear cogsets run 13 to 26 teeth.
__________________
"Early to bed, early to rise. Work like hell, and advertise." -- George Stahlman
Capo [dschaw'-poe]: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger, S/N 42624
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1981 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
John E is offline   Reply With Quote
Old 11-15-04, 09:35 PM   #16
MATTO
Senior Member
Thread Starter
 
Join Date: Nov 2004
Bikes:
Posts: 106
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
so what categorys would be mid rang?
ie chainring and cassette, i kinda want both but i guss its a trade off, i kinda dont wanna be working hard on flats..
MATTO is offline   Reply With Quote
Old 11-15-04, 11:36 PM   #17
blue_neon
Elite Rep
 
Join Date: Aug 2004
Location: Melbourne - Australia
Bikes:
Posts: 2,096
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by phantomcow2
I can hardly understand your english, try making your message clear and use the right word. its new not knew.
God, does it really matter that much?

Last edited by blue_neon; 11-16-04 at 12:21 AM.
blue_neon is offline   Reply With Quote
Old 11-16-04, 04:15 PM   #18
MATTO
Senior Member
Thread Starter
 
Join Date: Nov 2004
Bikes:
Posts: 106
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
well thanks to yall who helped me out
MATTO 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 03:46 AM.