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

nut and bolt as chainring bolts

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.

nut and bolt as chainring bolts

Old 07-16-16, 10:57 AM
  #1  
oj.
Member
Thread Starter
 
Join Date: Jan 2015
Location: Angus, Scotland
Posts: 27

Bikes: 2013 trek 4700d, 60's BSA road, United Dinero

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 13 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
nut and bolt as chainring bolts

would i be able to use a nut a bolt for my single-speed chainring rather than proper chainring bolts. the reason i'm asking this is because a need to space my chainring in a few mm and it would be easier for me just to buy some nuts, bolts and washers.
oj. is offline  
Old 07-16-16, 11:27 AM
  #2  
sch
Senior Member
 
Join Date: May 2003
Location: Mountain Brook. AL
Posts: 3,651
Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 208 Post(s)
Likes: 0
Liked 15 Times in 15 Posts
It would work more or less, need a pretty short bolt and a hex head (either hex or allen socket) is easier to deal with than
phillips or slot. About 3/8-1/2" long bolt depending on whether the head/nut/washers fit in the recesses or not.
Chain wheel fixing bolts fit the holes pretty snugly, regular bolts would not so you might get some slippage until the
chain wheel butts up against the bolt threads. A true fixie might result in a back and forth movement of the chain
ring because of this as you torque in two directions. A FW single speed would just move once.

Last edited by sch; 07-16-16 at 11:31 AM.
sch is offline  
Old 07-16-16, 11:27 AM
  #3  
Eric S. 
Senior Member
 
Eric S.'s Avatar
 
Join Date: Aug 2005
Location: Las Vegas, NV
Posts: 848

Bikes: '04 LeMond Buenos Aires, '82 Bianchi Nuova Racing, De Rosa SLX, Bridgestone MB-1, Guerciotti TSX, Torpado Aelle, LeMond Tourmalet 853, Bridgestone Radac

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 66 Post(s)
Liked 20 Times in 18 Posts
I suppose you could make it work, but I'd suggest purchasing TruVativ chainring bolts. Both ends have hex sockets and they come with spacers.

Eric S. is offline  
Old 07-16-16, 11:56 AM
  #4  
SquidPuppet
Calamari Marionette Ph.D
 
SquidPuppet's Avatar
 
Join Date: Dec 2013
Location: Coeur d' Alene
Posts: 7,873

Bikes: 3 Chinese Gas Pipe Nerdcycles and 2 Chicago Electroforged Boat Anchors

Mentioned: 74 Post(s)
Tagged: 0 Thread(s)
Quoted: 2349 Post(s)
Liked 9 Times in 9 Posts
Why not just get a narrower bottom bracket?
SquidPuppet is offline  
Old 07-16-16, 12:09 PM
  #5  
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 41,366

Bikes: 8

Mentioned: 188 Post(s)
Tagged: 0 Thread(s)
Quoted: 6980 Post(s)
Liked 341 Times in 265 Posts
OK it's easier, then Go Do It .

I design solutions looking at the bins in the IronMonger's store inventory.
fietsbob is offline  
Old 07-17-16, 12:56 AM
  #6  
corrado33
Senior Member
 
Join Date: Jun 2013
Location: Bozeman
Posts: 4,097

Bikes: 199? Landshark Roadshark, 198? Mondonico Diamond, 1987 Panasonic DX-5000, 1987 Bianchi Limited, Univega... Chrome..., 1989 Schwinn Woodlands, Motobecane USA Record, Raleigh Tokul 2

Mentioned: 24 Post(s)
Tagged: 0 Thread(s)
Quoted: 1125 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by oj. View Post
would i be able to use a nut a bolt for my single-speed chainring rather than proper chainring bolts. the reason i'm asking this is because a need to space my chainring in a few mm and it would be easier for me just to buy some nuts, bolts and washers.
Should work fine, it'll be ugly, but it'll work.

Originally Posted by Eric S. View Post
I suppose you could make it work, but I'd suggest purchasing TruVativ chainring bolts. Both ends have hex sockets and they come with spacers.

OOOOHhh I like those. I like those a lot. I hate dealing with stuck chainring bolts. But then again, it's not like they'd ever be rusted stuck on my bikes so perhaps not as useful as I think?
corrado33 is offline  
Old 07-17-16, 01:27 AM
  #7  
Eric S. 
Senior Member
 
Eric S.'s Avatar
 
Join Date: Aug 2005
Location: Las Vegas, NV
Posts: 848

Bikes: '04 LeMond Buenos Aires, '82 Bianchi Nuova Racing, De Rosa SLX, Bridgestone MB-1, Guerciotti TSX, Torpado Aelle, LeMond Tourmalet 853, Bridgestone Radac

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 66 Post(s)
Liked 20 Times in 18 Posts
Originally Posted by corrado33 View Post
Should work fine, it'll be ugly, but it'll work.



OOOOHhh I like those. I like those a lot. I hate dealing with stuck chainring bolts. But then again, it's not like they'd ever be rusted stuck on my bikes so perhaps not as useful as I think?

Once I realized a SRAM Rival crank I bought a few years ago had these 5mm/6mm chain ring bolts, I put them on all my bikes. I toy with gearing and give chain rings a thorough cleaning from time to time and these make life easier.
Eric S. is offline  
Old 07-17-16, 07:18 AM
  #8  
Moe Zhoost
Half way there
 
Moe Zhoost's Avatar
 
Join Date: Sep 2015
Location: Durham, NC
Posts: 1,746

Bikes: Many, and the list changes frequently

Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 522 Post(s)
Liked 204 Times in 125 Posts
Originally Posted by SquidPuppet View Post
Why not just get a narrower bottom bracket?
Or if you need to space the ring outward, you could add some spacers to the BB. If you need to go inward, try mounting the ring on the inside of the crank. Your plan would result in a functional system, but I would bet that you would have a bit of slop that would manifest itself as an irritating click.

Last edited by Moe Zhoost; 07-17-16 at 07:21 AM.
Moe Zhoost is offline  
Old 07-17-16, 08:18 AM
  #9  
FBinNY 
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 35,965

Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

Mentioned: 124 Post(s)
Tagged: 1 Thread(s)
Quoted: 4355 Post(s)
Likes: 0
Liked 11 Times in 11 Posts
Maybe, or no.

I depends on the crank arms and rings
. Some arms and rings have the ring supported on machined shoulders in the crank spider with the bolts providing only the retention and driving torque. However, that's a bit of extra work in production and many makers have eliminated the shoulders.

Without the locating shoulder, the ring depends on the OD of the outer bolt to locate the hole aligned with those in the crank arm, so it's properly concentric to the center. Poor concentricity causes 2 problems.

1- change in chain tension as the crank rotates. Some is normal, but more is worse.
2- allows the ring to shift u8nder load causing chronic loosening of the bolts, (and changing concentricity).

So, given what you have invested so far, the smart play is to shell out for chainring bolts that can reach past your spacers and position the ring correctly. Or, of you're only talking of 1-2mm, don't bother and live with the slight chainline error which is the lesser of evils.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline  
Old 07-17-16, 11:07 AM
  #10  
oj.
Member
Thread Starter
 
Join Date: Jan 2015
Location: Angus, Scotland
Posts: 27

Bikes: 2013 trek 4700d, 60's BSA road, United Dinero

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 13 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
i have measured the id of the chainring and the crank and i got 9.5mm which roughly equates to 3/8 of an inch. i can buy 3/8 bolts and i think that it should be close enough so there is no movement. also i would normally consider using bottom bracket spacer or buying a smaller bottom bracket as other have suggested but I am using a press fit bottom bracket that can't be any smaller so my only option is to move my sprocket inwards.
oj. is offline  
Old 07-17-16, 11:28 AM
  #11  
LesterOfPuppets
cowboy, steel horse, etc
 
LesterOfPuppets's Avatar
 
Join Date: Sep 2008
Location: Valley of the Sun.
Posts: 33,404

Bikes: everywhere

Mentioned: 56 Post(s)
Tagged: 1 Thread(s)
Quoted: 4505 Post(s)
Liked 323 Times in 210 Posts
How much in does it have to go?

Actual spacers aren't all that expensive
https://www.sjscycles.co.uk/chainset...ers-pack-of-5/

If you need to shift it in more than a mm or two, you might have to spring for a set of bolts for a double
https://www.sjscycles.co.uk/chainset...ainring-bolts/
LesterOfPuppets is online now  
Old 07-17-16, 11:51 AM
  #12  
oj.
Member
Thread Starter
 
Join Date: Jan 2015
Location: Angus, Scotland
Posts: 27

Bikes: 2013 trek 4700d, 60's BSA road, United Dinero

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 13 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
it has to move about 3-4mm
oj. is offline  
Old 07-17-16, 11:54 AM
  #13  
oj.
Member
Thread Starter
 
Join Date: Jan 2015
Location: Angus, Scotland
Posts: 27

Bikes: 2013 trek 4700d, 60's BSA road, United Dinero

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 13 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
i can get everything i need for £7
oj. is offline  
Old 07-17-16, 12:25 PM
  #14  
LesterOfPuppets
cowboy, steel horse, etc
 
LesterOfPuppets's Avatar
 
Join Date: Sep 2008
Location: Valley of the Sun.
Posts: 33,404

Bikes: everywhere

Mentioned: 56 Post(s)
Tagged: 1 Thread(s)
Quoted: 4505 Post(s)
Liked 323 Times in 210 Posts
Originally Posted by oj. View Post
i can get everything i need for £7
If you can get bolts that won't interfere with your chainstays and think a setup like this is worth saving a couple of pounds, I reckon you might as well go for it.

LesterOfPuppets is online now  
Old 07-17-16, 12:39 PM
  #15  
oj.
Member
Thread Starter
 
Join Date: Jan 2015
Location: Angus, Scotland
Posts: 27

Bikes: 2013 trek 4700d, 60's BSA road, United Dinero

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 13 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
cheers
oj. is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Lakerat
Bicycle Mechanics
8
10-10-17 06:58 AM
JamesNYC
Bicycle Mechanics
11
11-12-14 07:13 PM
clones2
Bicycle Mechanics
3
03-21-14 10:56 AM
bianchi10
Bicycle Mechanics
3
10-23-12 09:16 AM
Anthropy
Bicycle Mechanics
4
01-10-11 04:02 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


Thread Tools
Search this Thread

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

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