Go Back  Bike Forums > Bike Forums > Mountain Biking
Reload this Page >

30t from 28t

Notices
Mountain Biking Mountain biking is one of the fastest growing sports in the world. Check out this forum to discuss the latest tips, tricks, gear and equipment in the world of mountain biking.

30t from 28t

Old 01-09-21, 06:57 PM
  #1  
CanadianBiker32
Senior Member
Thread Starter
 
CanadianBiker32's Avatar
 
Join Date: Jul 2012
Location: Canada
Posts: 996

Bikes: Maxim, Rocky Mountain, Argon 18, Cervelo S2 Team

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 155 Post(s)
Liked 2 Times in 2 Posts
30t from 28t

right now i have a fat bikerunning in front one 28t
i need to replace soon
lbs only has a 30t
would. i see much difference going to a 30 from 28t?
most of riding is low gear in winter snowsuggestions??
CanadianBiker32 is offline  
Old 01-09-21, 08:14 PM
  #2  
Bigbus
Very Senior Member
 
Bigbus's Avatar
 
Join Date: Mar 2018
Location: Always on the Run
Posts: 1,010

Bikes: Giant Quasar & Fuji Roubaix

Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 327 Post(s)
Liked 234 Times in 174 Posts
From 28 to 30 you're going to increase torque needs by @7%. Do you have 7% more strength in your leg? If the answer is yes, go for it. If you feel like you couldn't push anymore than you are now, you might want to think about it. I personally would just go for it. When you're not slogging through the snow and mud you'll be able to go faster and that's always good, Right?
Bigbus is offline  
Old 01-09-21, 08:20 PM
  #3  
DeadGrandpa
Philosopher of Bicycling
 
DeadGrandpa's Avatar
 
Join Date: Sep 2014
Location: Carolina
Posts: 1,082

Bikes: Too many, yet not enough.

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 426 Post(s)
Liked 205 Times in 147 Posts
I have heard that a change of 2 teeth in front is equal to 6 teeth difference in back. You should look at Sheldon Brown's Gear Calculator for specific metrics regarding the different drive train ratios.

I currently run (on my 29x3 plus bike) a 30T front and 11-46 cassette. I imagine that changing to a 32T front ring would feel like I lost my lowest gear, but gained one more on the high end. I have no experience riding on snow, and the terrain, flat or hilly, would make a difference, too. Did you use your lowest gear a lot?
DeadGrandpa is offline  
Old 01-09-21, 08:31 PM
  #4  
CanadianBiker32
Senior Member
Thread Starter
 
CanadianBiker32's Avatar
 
Join Date: Jul 2012
Location: Canada
Posts: 996

Bikes: Maxim, Rocky Mountain, Argon 18, Cervelo S2 Team

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 155 Post(s)
Liked 2 Times in 2 Posts
lowest gear i do use alotas its for riding slow speed on snow pack trailsand climbing where u need to be spinning as normal riding
so im thinking maybe i should stay at 28t
CanadianBiker32 is offline  
Old 01-10-21, 11:19 AM
  #5  
c_m_shooter
Senior Member
 
c_m_shooter's Avatar
 
Join Date: Sep 2006
Location: Paradise, TX
Posts: 1,870

Bikes: Soma Pescadero, Surly Pugsley, Salsa Fargo, Schwinn Klunker, Gravity SS 27.5, Monocog 29er

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 102 Post(s)
Liked 122 Times in 92 Posts
I say you won't notice a difference.
c_m_shooter is offline  
Old 01-14-21, 03:44 AM
  #6  
Amt0571
Senior Member
 
Join Date: Dec 2014
Location: Catalonia
Posts: 888

Bikes: Canyon Grand Canyon AL SL 8.0, Btwin Ultra 520 AF GF, Dahon Mu P27, Triban Road 7, Benotto 850

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 375 Post(s)
Liked 169 Times in 114 Posts
It depends. If you use your lower gear frequently, you'll definitely notice. 2T at the front makes quite a big difference.
Amt0571 is offline  
Old 01-14-21, 10:21 PM
  #7  
Darth Lefty 
Disco Infiltrator
 
Darth Lefty's Avatar
 
Join Date: May 2013
Location: Folsom CA
Posts: 11,642

Bikes: Stormchaser, Paramount, Timberjack, Expert TG, Samba tandem

Mentioned: 66 Post(s)
Tagged: 0 Thread(s)
Quoted: 2267 Post(s)
Liked 942 Times in 621 Posts
It's exactly half a shift.
__________________
Genesis 49:16-17
Darth Lefty is offline  
Old 01-14-21, 11:28 PM
  #8  
Kapusta
Cyclochondriac
 
Join Date: Feb 2017
Posts: 4,280
Mentioned: 26 Post(s)
Tagged: 0 Thread(s)
Quoted: 1845 Post(s)
Liked 1,147 Times in 675 Posts
Originally Posted by Darth Lefty View Post
It's exactly half a shift.
I would have said about a half a shift, but I think this is a good way to think about it.
Kapusta is offline  
Old 01-14-21, 11:35 PM
  #9  
Darth Lefty 
Disco Infiltrator
 
Darth Lefty's Avatar
 
Join Date: May 2013
Location: Folsom CA
Posts: 11,642

Bikes: Stormchaser, Paramount, Timberjack, Expert TG, Samba tandem

Mentioned: 66 Post(s)
Tagged: 0 Thread(s)
Quoted: 2267 Post(s)
Liked 942 Times in 621 Posts
It’s almost exactly half a shift
__________________
Genesis 49:16-17
Darth Lefty is offline  
Likes For Darth Lefty:
Old 01-20-21, 09:06 AM
  #10  
DMC707 
Senior Member
 
DMC707's Avatar
 
Join Date: Jan 2013
Location: Oklahoma City
Posts: 4,134

Bikes: Too many to list

Mentioned: 33 Post(s)
Tagged: 0 Thread(s)
Quoted: 993 Post(s)
Liked 312 Times in 213 Posts
Hold out for what you like. Ive been on rides where 2 teethis the difference berween pedalling and pushing
DMC707 is offline  

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


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.