Cyclocross and Gravelbiking (Recreational) This has to be the most physically intense sport ever invented. It's high speed bicycle racing on a short off road course or riding the off pavement rides on gravel like :The Dirty Kanza". We also have a dedicated Racing forum for the Cyclocross Hard Core Racers.

1x road crank with direct mount chainring

Old 08-07-19, 08:07 AM
  #1  
vinuneuro
Senior Member
Thread Starter
 
Join Date: Mar 2014
Location: NW Chicagoland
Posts: 749

Bikes: 2016 Diverge Expert

Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 367 Post(s)
Liked 0 Times in 0 Posts
1x road crank with direct mount chainring

Sram only goes down to 38T with their road 1x chainrings. Are there any pros/cons with direct mount chainrings that offer smaller sizes?

There is some small weight saving with direct mount but it isn't a factor for me. My biggest concern is chainline, but I think it should be a non-issue.

Sram Force 1 chainrings have a 5.7mm offset.
Sram mtb and Wolftooth, etc offer rings with 6mm offset.

Are there any other factors that need to be considered?

Last edited by vinuneuro; 08-07-19 at 08:59 AM.
vinuneuro is offline  
Old 08-07-19, 10:40 AM
  #2  
gus6464
Senior Member
 
Join Date: Jan 2010
Location: San Diego
Posts: 1,979
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 238 Post(s)
Likes: 0
Liked 17 Times in 14 Posts
Nothing is stopping you from using the mtb direct mount chainring on the crank.

I have used a 32t sram chainring on a rival crank for a very gnarly gravel ride.

Last edited by gus6464; 08-07-19 at 10:43 AM.
gus6464 is offline  
Old 08-07-19, 11:55 AM
  #3  
TimothyH
- Soli Deo Gloria -
 
TimothyH's Avatar
 
Join Date: Aug 2015
Location: Northwest Georgia
Posts: 14,779

Bikes: 2018 Rodriguez Custom Fixed Gear, 2017 Niner RLT 9 RDO, 2015 Bianchi Pista, 2002 Fuji Robaix

Mentioned: 231 Post(s)
Tagged: 0 Thread(s)
Quoted: 6809 Post(s)
Liked 632 Times in 403 Posts
Easton EC90 SL Cinch, based on the Raceface design which Easton acquired, might be adjustable in terms of chainline depending on your bottom bracket width.

Easton states that the width of the bottom bracket shell + bottom bracket + seals + spacers needs to be 92.6 mm +/- 1 mm.

My bottom bracket (PF30 68 mm) + bottom bracket + seals was 86 mm which left about 6 mm side to side play for chainline adjustment. I played with various spacers on either side until chainline and shifting was right.


Originally Posted by vinuneuro View Post
Are there any other factors that need to be considered?
It isn't cheap.


-Tim-
TimothyH is offline  
Old 08-09-19, 08:33 AM
  #4  
TenGrainBread 
Senior Member
 
TenGrainBread's Avatar
 
Join Date: Sep 2015
Location: Madison, WI
Posts: 2,000
Mentioned: 40 Post(s)
Tagged: 0 Thread(s)
Quoted: 764 Post(s)
Liked 119 Times in 92 Posts
I put Profile Racing mountain bike cranks on my gravel bike. It's a direct mount 1x chainring system with an adjustable chainline that has a very wide range of adjustment via spacers. They also have chainrings for it all the way from the 20t range up to 50t.

The only downside is that the chainrings aren't narrow-wide. I haven't had any problems paired with my clutched XTR derailleur though.

Despite the cranks being chromoly cranks rated for downhill MTB, with the titanium axle added they are between 105 R7000 cranks and Ultegra R8000 in weight.
TenGrainBread is offline  
Old 08-09-19, 03:40 PM
  #5  
jideta 
Senior Member
 
Join Date: Apr 2019
Location: Honolulu
Posts: 225
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 81 Post(s)
Liked 121 Times in 67 Posts
Blackspire makes DM N/W chainrings in both normal and Boost configs.
jideta 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

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.