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

Trying to get my carbon fork from 43 to 45 mm rake -- correct heating temperature?

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.

Trying to get my carbon fork from 43 to 45 mm rake -- correct heating temperature?

Old 01-14-15, 06:19 PM
  #76  
Self Evident
Member
 
Join Date: Nov 2013
Posts: 36
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 11 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Do you have a pic of the fork after the re-rake, but without the new carbon wrap?

Last edited by Self Evident; 01-14-15 at 06:19 PM. Reason: minor typo
Self Evident is offline  
Old 01-14-15, 06:19 PM
  #77  
AnkleWork
Senior Member
 
Join Date: Jan 2013
Location: Llano Estacado
Posts: 3,307

Bikes: old clunker

Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
Quoted: 540 Post(s)
Likes: 0
Liked 25 Times in 15 Posts
Originally Posted by ljsense View Post
. . . But I don't imagine Henry Ford or the Wright brothers got it exactly right on the first try. . .
The accomplishments of Ford and the Wrights are well known. Please tell us what you think you have accomplished. Do you think trial and error guided them as it guides you?

Originally Posted by ljsense View Post
. . . Fingers crossed!
Yes, that's what you need, considering you know neither how much you weakened that fork, nor how much you might have strengthened it.
AnkleWork is offline  
Old 01-14-15, 06:22 PM
  #78  
ragtoplvr
Senior Member
 
Join Date: Sep 2012
Location: SW Missouri
Posts: 117

Bikes: specalized sirrus

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
But I don't imagine Henry Ford or the Wright brothers got it exactly right on the first try. So I am pushing on with this undaunted and I have some initial photos to show.
......../QUOTE]

Link to wright brothers first fatal plane crash

Wright Brother's First Fatal Airplane Crash

Rod
ragtoplvr is offline  
Old 01-14-15, 06:39 PM
  #79  
cobba
Senior Member
 
Join Date: Aug 2006
Posts: 1,677
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 93 Post(s)
Likes: 0
Liked 5 Times in 5 Posts
Originally Posted by ljsense View Post
Is that weed matting that you've wrapped around the fork legs?

Attached Images
File Type: jpg
Strawbedmat.jpg (85.8 KB, 48 views)
cobba is offline  
Old 01-14-15, 06:41 PM
  #80  
AnkleWork
Senior Member
 
Join Date: Jan 2013
Location: Llano Estacado
Posts: 3,307

Bikes: old clunker

Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
Quoted: 540 Post(s)
Likes: 0
Liked 25 Times in 15 Posts
Originally Posted by cobba View Post
Is that weed matting that you've wrapped around the fork legs?
Without vacuum bagging and proper prep, weed matting will work just as well as crabon fibre.
AnkleWork is offline  
Old 01-14-15, 06:58 PM
  #81  
spdntrxi
Senior Member
 
Join Date: Oct 2013
Location: East Bay Area ,CA
Posts: 1,553

Bikes: Parlee,BMC,Specialized and Trek

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 105 Post(s)
Liked 0 Times in 0 Posts
Enve 2.0 fork is nice... I still say you could have sold it and got another.. 43/45 is nearly impossible to notice the difference anyways. Wish you luck on the carbon wrap.. I don't think you need to vac bag it ... but personally I'm still in favor of that fork being in the dumpster (broken)
spdntrxi is offline  
Old 01-14-15, 07:15 PM
  #82  
GENESTARWIND
Senior Member
 
GENESTARWIND's Avatar
 
Join Date: Dec 2011
Location: las vegas
Posts: 1,917

Bikes: pake rum runner

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 20 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
this is ********.
GENESTARWIND is offline  
Old 01-14-15, 07:24 PM
  #83  
Wilfred Laurier
Señor Member
 
Wilfred Laurier's Avatar
 
Join Date: Feb 2013
Posts: 4,297
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 328 Post(s)
Liked 68 Times in 49 Posts
Originally Posted by spdntrxi View Post
but personally I'm still in favor of that fork being in the dumpster (broken)
Don't worry - you will get your wish pretty soon.
Wilfred Laurier is offline  
Old 01-14-15, 07:27 PM
  #84  
hueyhoolihan
Senior Member
 
Join Date: Dec 2010
Location: Above ground, Walnut Creek, Ca
Posts: 6,682

Bikes: 8 ss bikes, 1 5-speed touring bike

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 86 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
if it's not a put-on, the OP's an experimenter is all.

if so, i'm just surprised that he or she would want to expose him or herself to ridicule on an international forum. shows self-confidence anyway. good luck.

Last edited by hueyhoolihan; 01-14-15 at 11:05 PM.
hueyhoolihan is offline  
Old 01-14-15, 07:30 PM
  #85  
AnkleWork
Senior Member
 
Join Date: Jan 2013
Location: Llano Estacado
Posts: 3,307

Bikes: old clunker

Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
Quoted: 540 Post(s)
Likes: 0
Liked 25 Times in 15 Posts
Originally Posted by hueyhoolihan View Post
. . . shows self-confidence anyway. . .
Or something.
AnkleWork is offline  
Old 01-14-15, 07:37 PM
  #86  
Al1943
Senior Member
 
Join Date: Feb 2005
Location: Oklahoma
Posts: 9,438

Bikes: Trek 5500, Colnago C-50

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
4 pages already?
Al1943 is offline  
Old 01-14-15, 07:56 PM
  #87  
Shimagnolo
Senior Member
 
Shimagnolo's Avatar
 
Join Date: May 2008
Location: Zang's Spur, CO
Posts: 8,754
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 1576 Post(s)
Liked 71 Times in 50 Posts
Originally Posted by Al1943 View Post
4 pages already?
In the (paraphrased) words of a former IL governor:
"We've got this thing, and it's ***ing golden. We're just not giving it up for ****ing nothing."
Shimagnolo is online now  
Old 01-14-15, 07:59 PM
  #88  
JTGraphics
Senior Member
 
JTGraphics's Avatar
 
Join Date: Dec 2006
Location: So Cal
Posts: 2,678
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Wow I glanced over this post an can not be leave that this was done, but hay its your bike and well being.
I really hope nothing happens later over time.
A layer over the fork is not really going to make it stronger either.
I would never be able to ride with confidence knowing what was done here but that's me I guess.
Also I really do not think you would have even know you had a 43 rake fork on that bike, I would of left it as it was.

Best of luck to you!.
__________________
It may not be fancy but it gets me were I need to go.
http://www.jtgraphics.net/cyclist_bicycles.htm
JTGraphics is offline  
Old 01-14-15, 09:14 PM
  #89  
LeeG
Senior Member
 
Join Date: Sep 2008
Posts: 4,906
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 62 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Originally Posted by GENESTARWIND View Post
this is ********.
Yep. Pretty sure this is a put on. The "bending jig" in the pic doesn't match the description. Showing a wrapped fork doesn't show the flame damaged fork. A fetishist for "the right way" to build up a bike wouldn't tolerate a totally crapped looking fork slathered in epoxy.
Assuming this person is for real I was going to try to appeal to his experience riding where someone won't find their body as they've gone off into a ditch or off a cliff do to a failure at high speed, or simply missed vital advanced medical care on the way to the hospital. But I bet I'd be talking to a troll.
I and a friend had a bike shop 35 yrs ago. He sustained a significant head injury at low speed that cracked his skull and put him in a coma for 2wks and ICU for another. Took him a few years to recover. Been on a few rides where someone crashed and we were there to get him help/home. Same with races. Where emergency care was nearby.
There's too much wrong with this story.
LeeG is offline  
Old 01-15-15, 04:53 AM
  #90  
dabac
Senior Member
 
Join Date: Mar 2008
Posts: 7,903
Mentioned: 36 Post(s)
Tagged: 0 Thread(s)
Quoted: 813 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Originally Posted by Shimagnolo View Post
Go shopping the online stores for a road fork. 43mm-45mm is pretty much a defacto standard, so I would expect most frames to be designed to work with rake in that range.
Well, that's a large part of my point.
It's a common enough value, and we can't tell from here whether it was chosen by default, or as a result of test riding some alternatives.

Or maybe when the frames were ready for assembly, the manufacturer was offered a better deal on 45 mm forks than on 43 mm.

If 45 mm was a default decision, and assuming that riders are sensitive enough to correctly detect a 2 mm difference in rake, maybe some riders would actually prefer the 43. And there's probably someone out there who would have liked 47.
dabac is offline  
Old 01-15-15, 07:34 AM
  #91  
cyccommute 
Mad bike riding scientist
 
cyccommute's Avatar
 
Join Date: Nov 2004
Location: Denver, CO
Posts: 21,258

Bikes: Some silver ones, a red one, an orange one and a few titanium ones

Mentioned: 92 Post(s)
Tagged: 1 Thread(s)
Quoted: 2473 Post(s)
Likes: 0
Liked 104 Times in 71 Posts
Originally Posted by ragtoplvr View Post
There must be thousands of epoxy formulations out there, different cures, different ratio, different flexibility, different adhesion. It stands to reason that some are more able to be hot formed than others. Unless you know what one the mfg used, which is most likely a closely held secret, you are taking a shot the dark. Shots in the dark get folks hurt.

Rod
Epoxy resins all fall into the theromset category. They polymerize in an irreversible crosslink and, generally speaking, the idea is to drive the cure to completion. In other words, they aren't meant to be melted and reformed. The crosslinking is extensive enough that thermosets can't be recycled. They simply don't melt. Phenol/formaldehyde (Bakelite) resins crosslink extensively enough that they won't sustain combustion. They self-extinguish. Although I haven't tested it, I suspect that the epoxy resins used for carbon fiber would have a hard time maintaining combustion as well.

You are correct that hot reforming a carbon fork shouldn't be done, however. 'Tis a silly idea.
__________________
Stuart Black
Pokin' around the Poconos A cold ride around Lake Erie
Dinosaurs in Colorado A mountain bike guide to the Purgatory Canyon dinosaur trackway
Solo Without Pie. The search for pie in the Midwest.
Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
Days of Wineless Roads. Bed and Breakfasting along the KATY
Twisting Down the Alley. Misadventures in tornado alley.
An Good Ol' Fashion Appalachian Butt Whoopin'.

Last edited by cyccommute; 01-15-15 at 08:42 AM.
cyccommute is offline  
Old 01-15-15, 08:13 AM
  #92  
Wilfred Laurier
Señor Member
 
Wilfred Laurier's Avatar
 
Join Date: Feb 2013
Posts: 4,297
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 328 Post(s)
Liked 68 Times in 49 Posts
Originally Posted by LeeG View Post
I and a friend had a bike shop 35 yrs ago. He sustained a significant head injury at low speed that cracked his skull and put him in a coma for 2wks and ICU for another. Took him a few years to recover.
Sounds a lot like my first employer, although I realized later he never fully 'recovered' - he had no sense of smell and was paranoid and somewhat delusional.
Wilfred Laurier is offline  
Old 01-15-15, 10:33 AM
  #93  
3alarmer
******
 
3alarmer's Avatar
 
Join Date: Nov 2010
Location: The Big Tomato
Posts: 17,271

Bikes: old ones

Mentioned: 227 Post(s)
Tagged: 0 Thread(s)
Quoted: 14575 Post(s)
Liked 76 Times in 65 Posts
.
...this is why people have such a low opinion of hockey.
3alarmer is offline  
Old 01-15-15, 11:08 AM
  #94  
BenPS
will stop for donuts
 
BenPS's Avatar
 
Join Date: Jan 2014
Location: Maine
Posts: 214
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 13 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I can't believe that no one has mentioned how small 2mm is. Measure that out for a second, and then think about how much that will change the ride of the bike.

Troll or not, this thread delivers
BenPS is offline  
Old 01-15-15, 11:42 AM
  #95  
Black wallnut 
Senior Member
 
Black wallnut's Avatar
 
Join Date: Oct 2011
Location: Ellensburg,WA
Posts: 2,939

Bikes: Schwinn Broadway, Specialized Secteur Sport(crashed) Spec. Roubaix Sport, Spec. Crux

Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 57 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
If your pipe bursts and the stream of water cuts a hole in the drywall you do not simply patch the drywall.
__________________
Sir Mark, Knight of Sufferlandria
Black wallnut is offline  
Old 01-15-15, 11:43 AM
  #96  
woodcraft
Senior Member
 
woodcraft's Avatar
 
Join Date: Apr 2012
Location: Nor Cal
Posts: 4,219
Mentioned: 12 Post(s)
Tagged: 0 Thread(s)
Quoted: 1021 Post(s)
Likes: 0
Liked 33 Times in 19 Posts
This gives new meaning to the flame icon next to thread titles.
woodcraft is offline  
Old 01-15-15, 11:58 AM
  #97  
3alarmer
******
 
3alarmer's Avatar
 
Join Date: Nov 2010
Location: The Big Tomato
Posts: 17,271

Bikes: old ones

Mentioned: 227 Post(s)
Tagged: 0 Thread(s)
Quoted: 14575 Post(s)
Liked 76 Times in 65 Posts
Originally Posted by ljsense View Post
Oh, to your question. The build sheet on this Serotta says it wants a 45 mm rake. I just want this build to be right.
Originally Posted by ljsense View Post

Even if it handled ok, having the wrong rake would have always nagged at me though. I'm sure there's a reason why they called for a 45.
...there are some very effective medications for this now.

Originally Posted by woodcraft View Post
The fork might cumple.
...this sounds dirty.
3alarmer is offline  
Old 01-15-15, 12:01 PM
  #98  
3alarmer
******
 
3alarmer's Avatar
 
Join Date: Nov 2010
Location: The Big Tomato
Posts: 17,271

Bikes: old ones

Mentioned: 227 Post(s)
Tagged: 0 Thread(s)
Quoted: 14575 Post(s)
Liked 76 Times in 65 Posts
Originally Posted by Wilfred Laurier View Post
Sounds a lot like my first employer, although I realized later he never fully 'recovered' - he had no sense of smell and was paranoid and somewhat delusional.
...I once lost my sense of smell for a few months. It was terrible, but thankfully I recovered. Sadly, the paranoia and delusions persist.
3alarmer is offline  
Old 01-15-15, 12:36 PM
  #99  
CroMo Mike 
Senior Member
 
CroMo Mike's Avatar
 
Join Date: Nov 2013
Location: Richmond, Virginia
Posts: 1,240

Bikes: Listed in my signature.

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 94 Post(s)
Liked 0 Times in 0 Posts
2mm is .080" or, in laymans terms, just a hair more than 1/16". Very small in the scheme of things.
CroMo Mike is offline  
Old 01-15-15, 12:56 PM
  #100  
Scrodzilla
See you in Hell.
 
Scrodzilla's Avatar
 
Join Date: May 2009
Location: South of Heaven
Posts: 25,944

Bikes: EAI Bare Knuckle

Mentioned: 40 Post(s)
Tagged: 0 Thread(s)
Quoted: 573 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by ljsense View Post
I have a really nice Serotta with a build sheet that says it takes a 45 mm rake fork. But I have a 43 Enve 2.0, so I've been reading about epoxy and experimenting with ways to just gently bend that fork a bit deeper.
If you really think a difference of 2mm in rake will cause a huge difference in handling, you may be more insane than you seem.
Scrodzilla is offline  

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.