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

Stem adapter slips, any solutions?

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.

Stem adapter slips, any solutions?

Old 09-09-10, 02:45 PM
  #1  
seanile
Sheriff of Nottingham
Thread Starter
 
seanile's Avatar
 
Join Date: Jan 2009
Location: Boston
Posts: 189
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Stem adapter slips, any solutions?

hey everyone. i've got a bike with regular 1 inch threaded fork, but recently switched to 1-1/8th using a stem adapter. now, being that there's no top cap or star nut, it's just the stem gripping the adapter's neck, it tends to slip fairly easily.

anybody have any solutions for me here?

the only thing i can think of is taking some gritty sandpaper to the adapter and the stem to maybe rough up the surface and offer it some friction but i'd rather not.
seanile is offline  
Old 09-09-10, 02:57 PM
  #2  
fietsbob
Banned
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 43,599

Bikes: 8

Mentioned: 197 Post(s)
Tagged: 0 Thread(s)
Quoted: 7607 Post(s)
Liked 1,320 Times in 830 Posts
Some Ive seen are knurled rather than smooth .. you sure the quill isn't slipping in the fork,
instead of the stem grip around the adapter

There should be some rotational slipping.. keeps from breaking so much
when the bike falls over..
fietsbob is offline  
Old 09-09-10, 03:02 PM
  #3  
seanile
Sheriff of Nottingham
Thread Starter
 
seanile's Avatar
 
Join Date: Jan 2009
Location: Boston
Posts: 189
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
yea it's definitely the stem on the adapter that's slipping.
i'm all for a little give but this thing slides as if it's been greased. like, i'll start pulling to go up a hill and by the time i'm at the top the bars are twisted a few inches to the side.
seanile is offline  
Old 09-09-10, 03:21 PM
  #4  
CACycling
Senior Member
 
CACycling's Avatar
 
Join Date: Feb 2008
Location: Oxnard, CA
Posts: 4,565

Bikes: 2009 Fuji Roubaix RC; 2011 Fuji Cross 2.0; '92 Diamond Back Ascent EX

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Liked 6 Times in 5 Posts
How about some fiber grip (the stuff used for CF seat posts and stems)? Might give enough grip without any damage.
CACycling is offline  
Old 09-09-10, 03:29 PM
  #5  
fietsbob
Banned
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 43,599

Bikes: 8

Mentioned: 197 Post(s)
Tagged: 0 Thread(s)
Quoted: 7607 Post(s)
Liked 1,320 Times in 830 Posts
Loctite .. make a shim , such as cut from a drink can, perhaps?
or how about the old standby duct-tape?
fietsbob is offline  
Old 09-09-10, 04:04 PM
  #6  
duckforcover
Senior Member
 
Join Date: Apr 2009
Posts: 111
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
the star nut does not provide any gripping force to the stem...something else is wrong. I tried one of those adapters once, it was a piece of garbage. might not be the same one you have, though. is the wedge aluminum? if so, that might be the problem... you might think it's slipping on the 1 1/8 part, but it's really the quill part that's tuning.

regardless, the star nut won't make a difference.
duckforcover is offline  
Old 09-09-10, 04:22 PM
  #7  
fietsbob
Banned
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 43,599

Bikes: 8

Mentioned: 197 Post(s)
Tagged: 0 Thread(s)
Quoted: 7607 Post(s)
Liked 1,320 Times in 830 Posts
Star nuts go inside steel threadless forks , to have something for the screw thru the top cap to pull against.

seek out one of these : https://www.bbbparts.com/headparts_bhp20.php

You have to find a shop, with the distributor's account , in the US distributor is Bike Mine.

I got mine from R&E in Seattle
fietsbob is offline  
Old 09-09-10, 04:29 PM
  #8  
Garthr
Senior Member
 
Join Date: Oct 2008
Location: where
Posts: 1,288

Bikes: Franklin Frames Custom, Rivendell Bombadil

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Try a better adapter that absolutely will not slip.

Velo Orange stem adapter - silver https://www.velo-orange.com/vothstad.html
Dimension stem adapter - black https://www.treefortbikes.com/product...22361381___314

Or get a nice Nitto knurled surface one for $60. !!!! Absolutely the best quality. https://www.benscycle.net/index.php?m...43ebfafbbc3e04

Or, get some 1-1/8" shims to put under the stem..... lowest cost solution.
Garthr is offline  
Old 09-09-10, 04:43 PM
  #9  
duckforcover
Senior Member
 
Join Date: Apr 2009
Posts: 111
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
uh, you don't even need a starnut on a threadless headset once everything is tight... it really only helps to keep some pressure on the headset bearings while you tighten everything down. You can take it off after that, and it won't matter but will look like ass.

Only exeption is downhill or trials riders who use a bolt that goes all the way thru to the bottom of the crown.
duckforcover is offline  
Old 09-09-10, 04:49 PM
  #10  
AEO
Senior Member
 
AEO's Avatar
 
Join Date: Jun 2007
Location: A Coffin Called Earth. or Toronto, ON
Posts: 12,258

Bikes: Bianchi, Miyata, Dahon, Rossin

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Likes: 0
Liked 3 Times in 3 Posts
if you can't get the adapter to work without slipping, then there is something seriously wrong with the adapter or you're doing something seriously wrong.

I have 3 different adaptors, one has a completely smooth aluminum wedge, but that didn't cause my bars to slip at all. there might be too much grease or oil being used on the quill, or you're not tightening it enough.

The starnut on a threadless fork acts as a bearing pre-load adjuster, and it does NOTHING for quill adapters.
the top cap on adapters are really only there so it won't have this big gaping hole at the top of the fork.
Threaded forks rely on the threaded portion to adjust the bearing load.
__________________
Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
https://sanfrancisco.ibtimes.com/arti...ger-photos.htm

Last edited by AEO; 09-09-10 at 04:53 PM.
AEO is offline  
Old 09-09-10, 06:27 PM
  #11  
seanile
Sheriff of Nottingham
Thread Starter
 
seanile's Avatar
 
Join Date: Jan 2009
Location: Boston
Posts: 189
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
i know the quill/adapter isn't slipping because it has an inset bolt which pretty much leaves a pool to collect water and seize the bolt, so i glued a george washington dollar over it to keep the water out and his head doesn't spin when the bars do.
i've tightened the stem to neck of the adapter damn near to where i'm stripping the allen heads so i'm sure it's tight. i'm just gonna go with the explanation that it's too slick surface to surface.

i'm pretty sure it's the delta adapter, i got it for $10 when i was in a pinch out of state.
seanile is offline  
Old 09-09-10, 08:22 PM
  #12  
cbfight
Senior Member
 
Join Date: Oct 2008
Posts: 231
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by sreilly845 View Post
i know the quill/adapter isn't slipping because it has an inset bolt which pretty much leaves a pool to collect water and seize the bolt, so i glued a george washington dollar over it to keep the water out and his head doesn't spin when the bars do.
i've tightened the stem to neck of the adapter damn near to where i'm stripping the allen heads so i'm sure it's tight. i'm just gonna go with the explanation that it's too slick surface to surface.

i'm pretty sure it's the delta adapter, i got it for $10 when i was in a pinch out of state.
When you tighten the pinch bolts on the stem, do they go so far as to touch together? If so, you're losing clamping force and you'll have to shim it with a thin bit of aluminum from something like a soda can. If the pinch bolts are not touching, then I'd suggest picking up some medium grit sandpaper and going to town on the adapter to give your stem something to bite onto.
cbfight is offline  
Old 09-09-10, 10:18 PM
  #13  
seanile
Sheriff of Nottingham
Thread Starter
 
seanile's Avatar
 
Join Date: Jan 2009
Location: Boston
Posts: 189
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
it's like this stem, where there's only two bolts.


sandpaper it is.
Attached Images
File Type: jpg
21EkTX-527L..jpg (4.8 KB, 22 views)
seanile is offline  
Old 09-10-10, 03:07 AM
  #14  
dabac
Senior Member
 
Join Date: Mar 2008
Posts: 8,546
Mentioned: 46 Post(s)
Tagged: 0 Thread(s)
Quoted: 1035 Post(s)
Liked 231 Times in 171 Posts
Originally Posted by sreilly845 View Post
it's like this stem, where there's only two bolts.


sandpaper it is.
If the gap between the stem pinch bolts close up before squeezing the stem hard enough you can sand away all you like, and it still won't help. A soda can shim to increase the diameter of the stem will do wonders though.
dabac is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
ajregester
Classic & Vintage
5
03-26-13 05:47 PM
8bits
Bicycle Mechanics
7
01-09-12 09:52 PM
zmensing
Bicycle Mechanics
7
09-20-11 03:35 PM
MK313
Commuting
5
08-07-11 08:04 PM
ironpuppy13
Singlespeed & Fixed Gear
13
01-09-10 02:26 AM

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.