26mm bars in a 25.4 stem
06-23-08, 09:44 PM
#1
Senior Member
Thread Starter
Join Date: Feb 2006
Posts: 225
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
26mm bars in a 25.4 stem
I'm trying to fit a set of 26mm bars into a 25.4mm stem. Honestly, the bars fit fine inside the stem. It is a 2 piece stem/four bolt stem. It seems like it would work to me but I don't want them to pop loose and cause a crash.
The stem is a Truvativ XR and the bars are Profile Design Stoker.
https://www.jensonusa.com/store/imgWr..._40.jpg&type=3
https://www.jensonusa.com/store/imgWr...100.jpg&type=3
The stem is a Truvativ XR and the bars are Profile Design Stoker.
https://www.jensonusa.com/store/imgWr..._40.jpg&type=3
https://www.jensonusa.com/store/imgWr...100.jpg&type=3
06-24-08, 01:43 AM
#4
Senior Member
At least use a round file on the edge of the slots. Using a larger-diameter bar cause those edges to really dig into the bar and create stress-risers.
06-24-08, 03:34 AM
#5
Senior Member
Join Date: Jul 2000
Location: Snowy midwest
Posts: 5,391
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
An engineer will correctly tell you that the 26 mm bar should not be used in a 25.4 mm stem because the stress will be focused on only a few parts of the bar which could/will eventually lead to fatigue and failure.
HOWEVER, that is academic when put into real practice in this case. It will work and it will last several lifetimes.
HOWEVER, that is academic when put into real practice in this case. It will work and it will last several lifetimes.
06-24-08, 06:14 AM
#6
Senior Member
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 33,656
Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!
Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
Quoted: 2026 Post(s)
Likes: 0
Liked 1,096 Times
in
742 Posts
I assume the bars are Aluminum so you should have no problems. I wouldn't do it with carbon bars. As DannoXYZ mentioned, relieving the edges of the clamp is a good precaution.
06-24-08, 06:20 AM
#7
Perineal Pressurized
Join Date: Oct 2003
Location: In Ebritated
Posts: 6,555
Mentioned: 0 Post(s)
Tagged: 1 Thread(s)
Quoted: 3 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
An engineer will correctly tell you that the 26 mm bar should not be used in a 25.4 mm stem because the stress will be focused on only a few parts of the bar which could/will eventually lead to fatigue and failure.
HOWEVER, that is academic when put into real practice in this case. It will work and it will last several lifetimes.
HOWEVER, that is academic when put into real practice in this case. It will work and it will last several lifetimes.
You're mistaken, a lawyer would advise against it. An engineer would evaluate the situation and determine that it would perform within spec.
__________________
This is Africa, 1943. War spits out its violence overhead and the sandy graveyard swallows it up. Her name is King Nine, B-25, medium bomber, Twelfth Air Force. On a hot, still morning she took off from Tunisia to bomb the southern tip of Italy. An errant piece of flak tore a hole in a wing tank and, like a wounded bird, this is where she landed, not to return on this day, or any other day.
This is Africa, 1943. War spits out its violence overhead and the sandy graveyard swallows it up. Her name is King Nine, B-25, medium bomber, Twelfth Air Force. On a hot, still morning she took off from Tunisia to bomb the southern tip of Italy. An errant piece of flak tore a hole in a wing tank and, like a wounded bird, this is where she landed, not to return on this day, or any other day.
06-24-08, 03:00 PM
#8
Senior Member
Thread Starter
Join Date: Feb 2006
Posts: 225
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
An engineer will correctly tell you that the 26 mm bar should not be used in a 25.4 mm stem because the stress will be focused on only a few parts of the bar which could/will eventually lead to fatigue and failure.
HOWEVER, that is academic when put into real practice in this case. It will work and it will last several lifetimes.
HOWEVER, that is academic when put into real practice in this case. It will work and it will last several lifetimes.
06-24-08, 03:01 PM
#9
Senior Member
Thread Starter
Join Date: Feb 2006
Posts: 225
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
06-25-08, 12:38 AM
#10
Senior Member
Join Date: Sep 2007
Location: Vancouver
Posts: 1,437
Bikes: NOYB
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
Try putting a seatpost that's .4 mm bigger in diameter into your frame.
Doesn't work at all, does it? Try hitting it with a hammer.
Got it part way in, but the frame is damaged and the seatpost is wrecked? Oh well, at least you're just sitting on it. If it fails completely, you might bump your nads. It's not like you'll lose control of the bike and go face first into the pavement or something.
Doesn't work at all, does it? Try hitting it with a hammer.
Got it part way in, but the frame is damaged and the seatpost is wrecked? Oh well, at least you're just sitting on it. If it fails completely, you might bump your nads. It's not like you'll lose control of the bike and go face first into the pavement or something.
Last edited by Torchy McFlux; 06-25-08 at 12:46 AM.
