Best way to achieve 69 gear inches?
#1
Senior Member
Thread Starter
Join Date: Aug 2011
Posts: 295
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Best way to achieve 69 gear inches?
My Steamroller came set up 44/19, which makes going uphill easy, going downhill a *****, and is slow everywhere else. According to Sheldon's calculator 61.1 gear inches (For 700 X 25 / 25-622 tire with 165 mm cranks). So I'm aiming to move up to around 69 gear inches and there are quite a few ways to make that happen.
The stock Andel cranks have a 130 BCD and I see rings up to 50t available, so I could go 50t up front and keep the 19t in back for 69.4 gear inches. However it seems that most here are running 46t and 48t rings, is there any reason why going to a 50t would be a bad idea in this case?
The stock Andel cranks have a 130 BCD and I see rings up to 50t available, so I could go 50t up front and keep the 19t in back for 69.4 gear inches. However it seems that most here are running 46t and 48t rings, is there any reason why going to a 50t would be a bad idea in this case?
#2
Fixie Infamous
Join Date: Dec 2011
Location: SF
Posts: 10,474
Bikes: 2007 CAAD Optimo Track, 2012 Cannondale CAAD10, 1996 GT Force restomod, 2015 Cannondale CAADX
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 54 Post(s)
Likes: 0
Liked 4 Times
in
4 Posts
keep the front chainring... put a 16t cog in the back... 72.5... a little over, but its not a big deal
or if it is a big deal... throw a 17t on the back for 68.3.....
EDIT: only bad reason for not going up is due to cost... a decent front chainring will run you like 50 bucks minimum... you can get a rear cog for like... 15 bucks?
or if it is a big deal... throw a 17t on the back for 68.3.....
EDIT: only bad reason for not going up is due to cost... a decent front chainring will run you like 50 bucks minimum... you can get a rear cog for like... 15 bucks?
#5
sɹɐʇsɟoןןnɟsʇıbɟɯo
Join Date: Oct 2010
Location: seattle, too many links
Posts: 3,986
Bikes: fixed gear recumbent trike
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
the and els on my roller are 130 aswell. FWIW BBQ
#6
Veteran Racer
Join Date: Jul 2009
Location: Ciudad de Vacas, Tejas
Posts: 11,757
Bikes: 32 frames + 80 wheels
Mentioned: 26 Post(s)
Tagged: 0 Thread(s)
Quoted: 1331 Post(s)
Liked 763 Times
in
431 Posts
Well, I'll be. First time I've ever seen Andels in 130bcd, and Steamrollers used to come with 144bcd cranks.
#7
It's MY mountain
Join Date: Sep 2006
Location: Mt.Diablo
Posts: 10,001
Bikes: Klein, Merckx, Trek
Mentioned: 70 Post(s)
Tagged: 0 Thread(s)
Quoted: 4335 Post(s)
Liked 2,977 Times
in
1,614 Posts
I think there's some bias in the data, or how you perceive it. People with big rings are more likely to mention how big their rings are, or you're more likely to remember. I've got a 42-16 for 71". A 44-17 will be a fine gear for you at 68.3". There's no reason to change your ring except for looks, or unless you really want something part way between 68.3 and 72.5.
BTW, crank length has nothing to do with your gear... it does affect another parameter that Sheldon discusses, but not gear inches.
BTW, crank length has nothing to do with your gear... it does affect another parameter that Sheldon discusses, but not gear inches.
#8
Senior Member
Join Date: Aug 2010
Location: St Louis
Posts: 1,846
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
The chain ring and the cog are of about equal quality, so thats not a reason to change one over the other. Cogs are cheaper than rings, advantage cog. Rings are easier to swap out at home, advantage ring. More ability to fine tune things with rings, advantage ring. Rings wear out faster than cogs, advantage cog.
Thats how i see things.
Thats how i see things.
#9
Senior Member
Join Date: Jul 2006
Posts: 3,063
Mentioned: 63 Post(s)
Tagged: 0 Thread(s)
Quoted: 1216 Post(s)
Liked 183 Times
in
116 Posts
48t chainrings and smaller are mainly so common because they're stock on a lot of cranksets/bikes from the factory since they usually allow generous clearance with a wide variety of frames. Once you get past 48t you start running into chainstay clearance issues with the short spindles most SS/FG run.
So, nothing inherently wrong with running bigger chainrings, just make sure they fit on your frame.
So, nothing inherently wrong with running bigger chainrings, just make sure they fit on your frame.
#10
Senior Member
Thread Starter
Join Date: Aug 2011
Posts: 295
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Part of why I am looking at changing the ring is to go to a steel Surly chainring.
Excellent point, one I had overlooked. I checked and Surly states that the Steamroller has clearance for up to 50t -- and that explains the indentation on the drive-side chainstay. Thanks for the heads up.
48t chainrings and smaller are mainly so common because they're stock on a lot of cranksets/bikes from the factory since they usually allow generous clearance with a wide variety of frames. Once you get past 48t you start running into chainstay clearance issues with the short spindles most SS/FG run.
So, nothing inherently wrong with running bigger chainrings, just make sure they fit on your frame.
So, nothing inherently wrong with running bigger chainrings, just make sure they fit on your frame.
Last edited by Chesha Neko; 01-10-12 at 10:34 PM.
#12
sɹɐʇsɟoןןnɟsʇıbɟɯo
Join Date: Oct 2010
Location: seattle, too many links
Posts: 3,986
Bikes: fixed gear recumbent trike
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
i swear to god this 2011 roller is a ****ign piece of ****
#13
Veteran Racer
Join Date: Jul 2009
Location: Ciudad de Vacas, Tejas
Posts: 11,757
Bikes: 32 frames + 80 wheels
Mentioned: 26 Post(s)
Tagged: 0 Thread(s)
Quoted: 1331 Post(s)
Liked 763 Times
in
431 Posts
Too bad you never got the Big Block.
#14
Banned
Join Date: Jan 2011
Location: A1A
Posts: 588
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
@Chesha Neko...as someone who uses alu chainrings i will echo the question "why steel?", but fyi surly does offer steel rings in 130mm.
& sorry to hijack your thread, but as a steamroller owner/devotee i feel obligated to bring a few facts into the jdgesus & TejanoTrackie steamroller discussion...
mine is a 07 model, it came with 130mm rd2 crankset. i believe surly switched to 130 andels for completes in 09. so i don't see when 'rollers could've ever come with 144s. i have not even seen a 2011 sr in person so i cannot make a factual statement as to its quality, but are rd2 cranks so much superior to andels, & are differing handlebars so terrible & hard to change-out that they turned such a universally well-regarded bike into "a ****ign piece of ****"? because besides the colors, those are about the main things they changed over the years. and TT, could you please tell me about any bike, including your beloved bikedirect offerings, not going up a few bucks over the course of 3-4-5-years?
& sorry to hijack your thread, but as a steamroller owner/devotee i feel obligated to bring a few facts into the jdgesus & TejanoTrackie steamroller discussion...
mine is a 07 model, it came with 130mm rd2 crankset. i believe surly switched to 130 andels for completes in 09. so i don't see when 'rollers could've ever come with 144s. i have not even seen a 2011 sr in person so i cannot make a factual statement as to its quality, but are rd2 cranks so much superior to andels, & are differing handlebars so terrible & hard to change-out that they turned such a universally well-regarded bike into "a ****ign piece of ****"? because besides the colors, those are about the main things they changed over the years. and TT, could you please tell me about any bike, including your beloved bikedirect offerings, not going up a few bucks over the course of 3-4-5-years?
#15
Senior Member
Join Date: Jun 2007
Location: A Coffin Called Earth. or Toronto, ON
Posts: 12,257
Bikes: Bianchi, Miyata, Dahon, Rossin
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Likes: 0
Liked 5 Times
in
5 Posts
hey, if you're going to replace the entire thing, then you might as well go for 42x16.
https://www.gear-calculator.com/#
https://www.gear-calculator.com/#
__________________
Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
https://sanfrancisco.ibtimes.com/arti...ger-photos.htm
Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
https://sanfrancisco.ibtimes.com/arti...ger-photos.htm
#16
Old fart
Join Date: Nov 2004
Location: Appleton WI
Posts: 24,777
Bikes: Several, mostly not name brands.
Mentioned: 153 Post(s)
Tagged: 0 Thread(s)
Quoted: 3582 Post(s)
Liked 3,395 Times
in
1,929 Posts
#18
Senior Member
Thread Starter
Join Date: Aug 2011
Posts: 295
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Steel wears more slowly. My Steamroller is a daily commuter.
So my question is why would 42x16 be a better solution than 50x19?
hey, if you're going to replace the entire thing, then you might as well go for 42x16.
https://www.gear-calculator.com/#
https://www.gear-calculator.com/#
#19
Senior Member
Join Date: Jun 2007
Location: A Coffin Called Earth. or Toronto, ON
Posts: 12,257
Bikes: Bianchi, Miyata, Dahon, Rossin
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Likes: 0
Liked 5 Times
in
5 Posts
The more teeth a chain engages, the longer it will last.
__________________
Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
https://sanfrancisco.ibtimes.com/arti...ger-photos.htm
Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
https://sanfrancisco.ibtimes.com/arti...ger-photos.htm
#20
Banned
Join Date: Jan 2011
Location: A1A
Posts: 588
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
the main reason to buy just a new cog rather than chainring is simply cost. on the other hand, if you have to buy both a new ring & a new cog to get the g/i you are seeking, there is a school of thought that a bigger ring/cog combo will give better wear & longer life...