same gear inches?
#2
Senior Member
Join Date: Jul 2007
Posts: 2,114
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
I have no idea what size wheels you are running, so I can't give you the gear inches. But if you were running 26" then it would be 49.6 gear inches for the 42-22 and 50.6 for the 35-18
#3
Geek Extraordinaire
Join Date: Feb 2006
Location: Long Beach, CA
Posts: 1,769
Bikes: Bianchi Advantage Fixed Conversion; Specialized Stumpjumper FS Hardtail
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Assuming the same size tire, the 35/18 will feel slightly harder, but not much.
__________________
I'd rather have a bottle in front of me than a frontal lobotomy.
Sintesi Conversion Serotta Track
I'd rather have a bottle in front of me than a frontal lobotomy.
Sintesi Conversion Serotta Track
#4
Really Old Senior Member
2% IS pretty much the same.
#5
Senior Member
Thread Starter
Join Date: Jan 2006
Location: Pittsburgh, PA
Posts: 1,212
Bikes: Lemond Alpe d'Huez 2005
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
oops! i am running 700x32c...but yea its the same tire size...Just trying to get some info on some gear changes i am going to making in the future
#6
Senior Member
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 33,656
Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!
Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
Quoted: 2026 Post(s)
Likes: 0
Liked 1,096 Times
in
742 Posts
Gear-inches = (chainring teeth/cog teeth)*wheel diameter. For both 27" and 700c wheels, the usual wheel diameter value used is 27.
In your example a 42/22 would be (42/22)*27 = 51.5 gear-inches and a 35/18 would be (35/18)*27 = 52.5 gear-iches so the difference is about 2% which is negligable.
You can use this equation for any gear combination you are interested in comparing.
In your example a 42/22 would be (42/22)*27 = 51.5 gear-inches and a 35/18 would be (35/18)*27 = 52.5 gear-iches so the difference is about 2% which is negligable.
You can use this equation for any gear combination you are interested in comparing.
#7
Videre non videri
Join Date: Sep 2004
Location: Gothenburg, Sweden
Posts: 3,208
Bikes: 1 road bike (simple, light), 1 TT bike (could be more aero, could be lighter), 1 all-weather commuter and winter bike, 1 Monark 828E ergometer indoor bike
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 4 Times
in
4 Posts
For any two sprocket combos giving the same gear ratio, the one with the bigger sprockets will be heavier, but will also provide greater chain engagement, improving efficiency and safety slightly.
#8
Senior Member
Essentially equivalent gearing. You will not be able to tell the 1" difference in gearing between the two.
__________________
Il faut de l'audace, encore de l'audace, toujours de l'audace
1980 3Rensho-- 1975 Raleigh Sprite 3spd
1990s Raleigh M20 MTB--2007 Windsor Hour (track)
1988 Ducati 750 F1
Il faut de l'audace, encore de l'audace, toujours de l'audace
1980 3Rensho-- 1975 Raleigh Sprite 3spd
1990s Raleigh M20 MTB--2007 Windsor Hour (track)
1988 Ducati 750 F1