Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

53 chainring with 34 chainring?

Notices
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.

53 chainring with 34 chainring?

Old 05-20-12, 07:29 AM
  #1  
Senior Member
Thread Starter
 
Join Date: Oct 2008
Location: Miami, FL
Posts: 1,739

Bikes: 2009 BMC SLX01/2016 Santa Cruz Bronson

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 8 Post(s)
Likes: 0
Liked 3 Times in 1 Post
53 chainring with 34 chainring?

I currently have a compact setup on my bike, I would like to swap the big ring for a standard 53 size chainring and leave the granny gear the same.

I think i have a 52/34, and would be changing to a 53/34.

I live in flat Florida, and end up spinning out with a 12/25 cassette on long sprints.

Would changing the cassette to a 11/25 have more of an impact?
jesspal is offline  
Old 05-20-12, 07:48 AM
  #2  
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: 2027 Post(s)
Likes: 0
Liked 1,099 Times in 745 Posts
Changing to a 53 from a 50T chainring will increase your top gear by 6% and probably cause front shifting problems and sluggishness and possibly require a longer chain. Changing to an 11T cassette will increase your top gear by 9% and have none of the negatives associated with the chainring change.
HillRider is offline  
Old 05-20-12, 08:10 AM
  #3  
Senior Member
 
Join Date: Dec 2009
Posts: 4,700
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 5 Times in 4 Posts
If you do have a 52, changing to a 53 won't make a damn bit of difference.
achoo is offline  
Old 05-20-12, 08:13 AM
  #4  
Senior Member
 
Shimagnolo's Avatar
 
Join Date: May 2008
Location: Zang's Spur, CO
Posts: 9,089
Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 3427 Post(s)
Liked 5,638 Times in 2,926 Posts
Originally Posted by achoo
If you do have a 52, changing to a 53 won't make a damn bit of difference.
Sure it will!
At the cadence he was doing at 35mph, he will now be doing 35.67mph!
Shimagnolo is online now  
Old 05-20-12, 08:13 AM
  #5  
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: 2027 Post(s)
Likes: 0
Liked 1,099 Times in 745 Posts
Originally Posted by achoo
If you do have a 52, changing to a 53 won't make a damn bit of difference.
The OP says he has a compact crank so his current big chainring is a probably a 50T. If by any chance it really is a 52, the change to a 53 would indeed be trivial.
HillRider is offline  
Old 05-20-12, 08:21 AM
  #6  
Senior Member
 
Kimmo's Avatar
 
Join Date: Dec 2009
Location: Melbourne, Oz
Posts: 9,555

Bikes: https://weightweenies.starbike.com/forum/viewtopic.php?f=10&t=152015&p=1404231

Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 1533 Post(s)
Liked 725 Times in 515 Posts
Think about it this way: 53/12 = 4.417, so around that ratio, adding or removing 1 sprocket tooth is worth nearly 4.5 chainring teeth.

So 57/13 (4.385) and 49/11 (4.455) are about as close as you get either side of it. Dig?

Last edited by Kimmo; 05-20-12 at 08:25 AM.
Kimmo is offline  
Old 05-20-12, 10:07 AM
  #7  
Banned
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 43,598

Bikes: 8

Mentioned: 197 Post(s)
Tagged: 0 Thread(s)
Quoted: 7607 Post(s)
Liked 1,360 Times in 866 Posts
If you accept greasy finger up- shifting, rather than expect snappy indexing,
then all sorts of combinations work.
fietsbob is offline  
Old 05-20-12, 10:09 AM
  #8  
Senior Member
 
wphamilton's Avatar
 
Join Date: Apr 2011
Location: Alpharetta, GA
Posts: 15,280

Bikes: Nashbar Road

Mentioned: 71 Post(s)
Tagged: 0 Thread(s)
Quoted: 2934 Post(s)
Liked 341 Times in 228 Posts
Originally Posted by jesspal
I currently have a compact setup on my bike, I would like to swap the big ring for a standard 53 size chainring and leave the granny gear the same.

I think i have a 52/34, and would be changing to a 53/34.

I live in flat Florida, and end up spinning out with a 12/25 cassette on long sprints.

Would changing the cassette to a 11/25 have more of an impact?
Considerably more.
wphamilton is offline  
Old 05-20-12, 10:18 AM
  #9  
Senior Member
 
Join Date: Mar 2007
Posts: 6,401
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 15 Times in 15 Posts
And with the technical aspect out of the way, I'd like to suggest the OP start sending out his resume to professional racing teams. Anyone who can "spin out" a 52x12 on a flat road during a "long sprint" is going to attract some interest.
Six jours is offline  
Old 05-20-12, 10:23 AM
  #10  
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: 2027 Post(s)
Likes: 0
Liked 1,099 Times in 745 Posts
Originally Posted by Six jours
And with the technical aspect out of the way, I'd like to suggest the OP start sending out his resume to professional racing teams. Anyone who can "spin out" a 52x12 on a flat road during a "long sprint" is going to attract some interest.
Even if it really is 50/12 it's still impressive. 100 rpm in that gear (112 gear-inches) is 34 mph.
HillRider is offline  
Old 05-20-12, 10:27 AM
  #11  
George Krpan
 
Join Date: Jan 2007
Location: Westlake Village, California
Posts: 1,708
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Likes: 0
Liked 1 Time in 1 Post
At 104rpm you would be going 34 mph with a 50/12 combination.

That's nowhere near spinning out.
GeoKrpan is offline  
Old 05-20-12, 10:35 AM
  #12  
Senior Member
 
Join Date: Mar 2007
Posts: 6,401
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 15 Times in 15 Posts
IMO "spinning out" involves a cadence of 120 rpm at the very least. That's almost 41 MPH with a 52x12.

But a rider with a half-way decent pedal stroke will find that 120 RPM isn't anywhere close to "spinning out" and can actually be maintained with no more than slight discomfort. That rider would tell you that "spinning out" isn't even a concept until 150 rpm - more than 50 mph in a 52x12.

Of course, if he's a track racer, he'll be able to flirt with 200 rpm - as long as he can manage almost 68 mph.

So my post was really a suggestion that the OP forget about his gearing and try working on his pedaling - unless he really is exceeding 40 MPH on long flat sprints, in which case my suggestion about contacting the pro teams is a serious one.
Six jours is offline  
Old 05-20-12, 11:52 AM
  #13  
Senior Member
 
Drew Eckhardt's Avatar
 
Join Date: Apr 2010
Location: Mountain View, CA USA and Golden, CO USA
Posts: 6,341

Bikes: 97 Litespeed, 50-39-30x13-26 10 cogs, Campagnolo Ultrashift, retroreflective rims on SON28/PowerTap hubs

Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 550 Post(s)
Liked 326 Times in 226 Posts
Originally Posted by GeoKrpan
At 104rpm you would be going 34 mph with a 50/12 combination.

That's nowhere near spinning out.
It's not even fast enough to make maximum power - that takes 110-120 RPM which yields 36 - 39 MPH.

And with good fit and form 140 RPM isn't out of the question (46 MPH)
Drew Eckhardt is offline  
Old 05-20-12, 12:58 PM
  #14  
Senior Member
Thread Starter
 
Join Date: Oct 2008
Location: Miami, FL
Posts: 1,739

Bikes: 2009 BMC SLX01/2016 Santa Cruz Bronson

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 8 Post(s)
Likes: 0
Liked 3 Times in 1 Post
thanks for the advice, I will swap the cassette
jesspal is offline  
Old 05-20-12, 01:42 PM
  #15  
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: 2027 Post(s)
Likes: 0
Liked 1,099 Times in 745 Posts
Originally Posted by Drew Eckhardt
It's not even fast enough to make maximum power - that takes 110-120 RPM which yields 36 - 39 MPH.

And with good fit and form 140 RPM isn't out of the question (46 MPH)
For a trained racer and someone who is comfortable with high cadence, you are correct. However there are those for whom high rpm is not only uncomfortable but not obtainable. I'm one of them. I CANNOT maintain a cadence over about 85 rpm under any conditions. All I get is winded and go slower than if I upshift and use a higher gear at lower cadence. Yeah, I know I should have "trained" myself to spin faster years ago but after numerous serious attempts I realized it wasn't going to work.

That said, a 50x11 is a VERY tall high gear even for gear mashers.
HillRider is offline  
Old 05-20-12, 04:50 PM
  #16  
Expired Member
 
shelbyfv's Avatar
 
Join Date: Jun 2007
Location: TN
Posts: 11,927
Mentioned: 41 Post(s)
Tagged: 0 Thread(s)
Quoted: 3811 Post(s)
Liked 5,824 Times in 2,944 Posts
If you still spin out with the 50/11, get a standard, as opposed to compact, crank. You obviously will have no use for that weak 34t small ring!
shelbyfv is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Sabi
Folding Bikes
7
08-27-17 07:46 AM
ripemango
Bicycle Mechanics
5
07-07-16 12:47 PM
motorapido
Bicycle Mechanics
5
07-11-12 10:20 PM
nubike
Bicycle Mechanics
15
02-11-11 11:30 AM
MarkN
Bicycle Mechanics
14
06-29-10 03:44 PM

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.