Go Back  Bike Forums > Bike Forums > Fatbikes
Reload this Page >

Opinion On 28T to 30T

Notices
Fatbikes Designed for use in sand, mud or snow, Fat bikes are the right choice for true all-terrain riding. Check here for the latest on these fun, adventurous two-wheeled machines.

Opinion On 28T to 30T

Old 01-12-21, 04:59 PM
  #1  
Senior Member
Thread Starter
 
CanadianBiker32's Avatar
 
Join Date: Jul 2012
Location: Canada
Posts: 1,006

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

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 165 Post(s)
Liked 2 Times in 2 Posts
Opinion On 28T to 30T

Just recently I am about to be in the need to replace my front ring.

I am running 28T on it at the moment and I do feel i need that ratio. As often in my lowest gear when riding up a big climb in snow. I need to spin.
However seems to be a shortage of 28T's around just 30T.
Would i see much difference if i got 30T for my Fat bike?
CanadianBiker32 is offline  
Old 01-12-21, 05:53 PM
  #2  
Senior Member
 
Join Date: Mar 2017
Location: Madison, WI
Posts: 1,923

Bikes: Giant Toughroad SLR1 and Motobecane Sturgis NX

Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 900 Post(s)
Liked 231 Times in 168 Posts
in the lowest gear it will be proportionally harder. If it matters, only you can know after trying. Over the years I went the opposite to lower and lower gears on my fatbike. Especially in the low-speed and high resistance situations like deep snow.
HerrKaLeun is offline  
Old 01-13-21, 11:32 AM
  #3  
Senior Member
 
trailangel's Avatar
 
Join Date: Feb 2014
Location: Pasadena, CA
Posts: 4,848

Bikes: Schwinn Varsity

Mentioned: 22 Post(s)
Tagged: 0 Thread(s)
Quoted: 1931 Post(s)
Liked 742 Times in 422 Posts
you would see a two tooth difference.
trailangel is offline  
Old 01-16-21, 07:51 AM
  #4  
Senior Member
 
hokiefyd's Avatar
 
Join Date: Feb 2017
Location: Northern Shenandoah Valley
Posts: 4,136

Bikes: More bikes than riders

Mentioned: 36 Post(s)
Tagged: 0 Thread(s)
Quoted: 1443 Post(s)
Liked 758 Times in 567 Posts
Originally Posted by CanadianBiker32
Just recently I am about to be in the need to replace my front ring.

I am running 28T on it at the moment and I do feel i need that ratio. As often in my lowest gear when riding up a big climb in snow. I need to spin.
However seems to be a shortage of 28T's around just 30T.
Would i see much difference if i got 30T for my Fat bike?
I recommend figuring out the gear inch range that you use and then go from there. For example, if you currently run 26x4" tires, a 28t chain ring, and an 11-46 cassette, your gear inch range is 18.2" on the low end and 76.1" on the high end. Is that the right range for you? It sounds like you want or need the low gear you currently have (a 30t would increase your low gear from 18.2" to 19.5"). Do you spin out of your high gear or is that sufficient? A 30t would increase your high gear from 76.1" to 81.5".

If these changes look consistent, it's because they are. It's about a 7% increase in gear ratio.

I recommend figuring gear inches because, depending on your cassette, you MAY be able to approximate what the change will be with different gears. For example, if your second tallest sprocket is a 42t, then the combination of your existing 28t chain ring and 2nd gear 42t sprocket is 19.9". That's almost the same as your low gear with a new 30t chain ring and 1st gear 46t sprocket (19.5"). So could you live with your second tallest sprocket as your bike is now as your lowest gear?

Obviously, all of that changes depending on the configuration of your bike (tire size, cassette, etc.). But trying to imagine a 7% change can be difficult, so doing the math may enable you to find a combination on your current drivetrain that will be equivalent to your new setup and would allow you to "try before you ride".
hokiefyd is offline  
Old 01-16-21, 03:38 PM
  #5  
Senior Member
 
Join Date: Apr 2019
Location: Windsor Ontario, Canada
Posts: 531

Bikes: 2018 Giant Sedona

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 179 Post(s)
Liked 116 Times in 95 Posts
Going to a 30T chainring from a 28 would make it 7% harder to climb. The longer the hill, The greater overall effort required. The short hills where I live I can climb with tall gears. If I had to climb a moderately steep hill 1/4 mile long I would need a much lower gear.

On the plus side though it will pay off under light loads. Sometimes it ballances out. A little more effort to climb is rewarded with more efficient riding at other times.
xroadcharlie is offline  
Old 01-17-21, 12:04 PM
  #6  
Senior Member
 
Join Date: May 2018
Location: Fargo ND
Posts: 898

Bikes: Time Scylon, Lynskey R350, Ritchey Breakaway, Ritchey Double Switchback, Lynskey Ridgeline, ICAN Fatbike

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 463 Post(s)
Liked 546 Times in 306 Posts
To the OP:
I just took a look at Chain reaction Cycles web site. They list 40 different in stock 28 tooth chain rings for SRAM, Race Face , Hope, Shimano, and a lot more crank sets. I just received a Hope crankset with Bottom Bracket in less than a week. Your LBS doesn't have wholesalers with the inventory of the online giants like CRC.
DangerousDanR is offline  
Old 01-27-21, 11:11 PM
  #7  
Junior Member
 
Join Date: Jan 2021
Posts: 12
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Liked 3 Times in 2 Posts
Originally Posted by xroadcharlie
Going to a 30T chainring from a 28 would make it 7% harder to climb. The longer the hill, The greater overall effort required. The short hills where I live I can climb with tall gears. If I had to climb a moderately steep hill 1/4 mile long I would need a much lower gear.

On the plus side though it will pay off under light loads. Sometimes it ballances out. A little more effort to climb is rewarded with more efficient riding at other times.
I have 28T and wanted to go 30T and change my cassette from 11-42 to 11-50. That should be ok right?
Dumpngo is offline  
Old 01-28-21, 03:17 PM
  #8  
Senior Member
 
Join Date: Apr 2019
Location: Windsor Ontario, Canada
Posts: 531

Bikes: 2018 Giant Sedona

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 179 Post(s)
Liked 116 Times in 95 Posts
Originally Posted by Dumpngo
I have 28T and wanted to go 30T and change my cassette from 11-42 to 11-50. That should be ok right?
I don't know much about the mechanics involved with what you are suggesting. But I believe the rear derailleur has a max limit as to the size of the largest sprocket as well as the max difference in teeth You could google your unit for starters.

Actually 30/42 is pretty low. I would try that first if you can't find a 28.
xroadcharlie is offline  
Old 01-29-21, 07:06 AM
  #9  
Senior Member
 
hokiefyd's Avatar
 
Join Date: Feb 2017
Location: Northern Shenandoah Valley
Posts: 4,136

Bikes: More bikes than riders

Mentioned: 36 Post(s)
Tagged: 0 Thread(s)
Quoted: 1443 Post(s)
Liked 758 Times in 567 Posts
Originally Posted by xroadcharlie
I don't know much about the mechanics involved with what you are suggesting. But I believe the rear derailleur has a max limit as to the size of the largest sprocket as well as the max difference in teeth You could google your unit for starters.

Actually 30/42 is pretty low. I would try that first if you can't find a 28.
I have a 26t with an 11-46 Microshift 9-speed setup. If 30/42 is pretty low, then 26/46 is really low...but still nice for spinning up stuff that I'd prefer to ride rather than walk.
hokiefyd is offline  
Old 01-29-21, 07:08 AM
  #10  
Senior Member
 
hokiefyd's Avatar
 
Join Date: Feb 2017
Location: Northern Shenandoah Valley
Posts: 4,136

Bikes: More bikes than riders

Mentioned: 36 Post(s)
Tagged: 0 Thread(s)
Quoted: 1443 Post(s)
Liked 758 Times in 567 Posts
Originally Posted by Dumpngo
I have 28T and wanted to go 30T and change my cassette from 11-42 to 11-50. That should be ok right?
If your rear derailleur can handle that range, then a 30t combined with an 11-50 will increase your high gear ratio and will also decrease your low gear ratio compared with a 28t with an 11-42. You'll have more gear range and your low will be lower and your high will be higher.
hokiefyd is offline  
Old 01-29-21, 09:05 AM
  #11  
Junior Member
 
Join Date: Jan 2021
Posts: 12
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Liked 3 Times in 2 Posts
Originally Posted by hokiefyd
If your rear derailleur can handle that range, then a 30t combined with an 11-50 will increase your high gear ratio and will also decrease your low gear ratio compared with a 28t with an 11-42. You'll have more gear range and your low will be lower and your high will be higher.
Exactly how I want. Thanks!
Dumpngo 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
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.