5.9kg Road Gravel Bike - DIY Homemade Carbon Frame

Who are you (no off-topic talk please)

Moderators: MrCurrieinahurry, maxim809, Moderator Team

Post Reply
User avatar
Erwandy
Posts: 53
Joined: Mon Jul 27, 2015 2:14 pm

by Erwandy

Just completed a 100% self built carbon frame.

Image

Attachments
IMG_20221001_080345.jpg

by Weenie


Visit starbike.com Online Retailer for HighEnd cycling components
Great Prices ✓    Broad Selection ✓    Worldwide Delivery ✓

www.starbike.com



User avatar
spokenwords
Posts: 165
Joined: Wed Jun 20, 2018 3:21 am

by spokenwords

congrats! Hope it rides well. Paint looks great.
"Notice how the door closes when the chimes of freedom ring." Joe Strummer
"this goes to 11" Nigel Tufnel
Dont move to Austin

User avatar
Erwandy
Posts: 53
Joined: Mon Jul 27, 2015 2:14 pm

by Erwandy

spokenwords wrote:
Sun Oct 02, 2022 1:00 am
congrats! Hope it rides well. Paint looks great.
Thanks. I hope so too! lol

jpeterson1012
Posts: 258
Joined: Fri Dec 20, 2019 10:06 pm
Location: Chicago

by jpeterson1012

ermmm yeah, lets not do this... while building frames from carbon tube stock is common especially with lugged frames, to say the construction methods shown in the video are far from sound would be a great understatement.

User avatar
LouisN
Posts: 3296
Joined: Mon Feb 19, 2007 3:44 am
Location: Canada

by LouisN

Wow ! That's ....entertaining :mrgreen: !
So many things to question but let's remain positive...
Have fun on your bike, be very careful, and good luck :beerchug: !!

Louis :)

User avatar
Erwandy
Posts: 53
Joined: Mon Jul 27, 2015 2:14 pm

by Erwandy

LouisN wrote:
Sun Oct 02, 2022 7:25 pm
Wow ! That's ....entertaining :mrgreen: !
So many things to question but let's remain positive...
Have fun on your bike, be very careful, and good luck :beerchug: !!

Louis :)
Thanks!
No worries, I am used to this. It is human nature to be skeptical of something they believe they know in theory to be potentially unsound. And they judge based on that beliefs. Me on the other hand, I prefer to test it practically and my satisfaction is knowing for real what wortks and what don't. For example I can already tell you, a 2mm thickness carbon fiber wall is safe for riders under 70kg, and for riders above 100kg, it will have to be carbon tubes with 5mm of thickness and 6 layers of carbon fiber sheets on the joints.

Feel free to shoot me questions and I am happy to share what I do know for sure. And yes I am having a blast here with this bike. Yesterday I did repeated speed bumps attack to see if the frame will buckle with sudden jolts. Happy to say she passed admirably.
Cheers
Last edited by Erwandy on Mon Oct 03, 2022 5:04 am, edited 1 time in total.

User avatar
LouisN
Posts: 3296
Joined: Mon Feb 19, 2007 3:44 am
Location: Canada

by LouisN

I question myself why did you cover the RD hanger with epoxied carbon layers ? It would have been so simple to just work around. Guess you'll Dremel your way to the screws if it bends or snaps ;) ...

Louis :)

User avatar
Erwandy
Posts: 53
Joined: Mon Jul 27, 2015 2:14 pm

by Erwandy

LouisN wrote:
Mon Oct 03, 2022 3:44 am
I question myself why did you cover the RD hanger with epoxied carbon layers ? It would have been so simple to just work around. Guess you'll Dremel your way to the screws if it bends or snaps ;) ...

Louis :)
There's little space for me to epoxy the right side dropout. And since an RD hanger is the least likely that I will need to swap out, I opted to just integrate it together. Since 2009 when I started cycling seriously, I can only recall that I have to swap out one RD out of over 20 bikes I owned since then.

If they do need replacement, it is an easy fix to run a circular Dremer cutter to trace the RD body. And then it's an easy fix to slap in new ones, lol

reedplayer
Posts: 744
Joined: Sat Nov 14, 2015 10:10 am

by reedplayer

Nice frame you created here. Really impressed by your skills (....it is so difficult to handle those carbon fibres).

Seat angle looks sharp, how many degrees has it?

Regards,

User avatar
Miller
Posts: 2525
Joined: Thu Sep 21, 2006 8:54 pm
Location: Reading, UK

by Miller

@Erwandy, looking at your video, for on-bike shots from the handlebar you might want to try a 360 cam like an Insta360 OneX 1/2/3. You can render your 16:9 edit from a 360 degree field of view and the selfie stick will be invisible.

spartacus
Posts: 791
Joined: Mon Apr 04, 2011 6:53 pm

by spartacus

Erwandy wrote:
Mon Oct 03, 2022 12:44 am
For example I can already tell you, a 2mm thickness carbon fiber wall is safe for riders under 70kg, and for riders above 100kg, it will have to be carbon tubes with 5mm of thickness and 6 layers of carbon fiber sheets on the joints.
Isn't a carbon fiber tube with 5mm walls like strong enough to hold the weight of a car? There are bikes with 100kg weight limits and tubing thinner than 2mm so I'm curious what you mean. Guess I should watch the video.

by Weenie


Visit starbike.com Online Retailer for HighEnd cycling components
Great Prices ✓    Broad Selection ✓    Worldwide Delivery ✓

www.starbike.com



MichaelK
Posts: 286
Joined: Wed Jul 04, 2018 4:50 pm

by MichaelK

The tubes could be an inch thick, doesn't matter... the bonds are joints between the tubes are far more important. Case in point 11 minutes into the video. I very much doubt the epoxy would have permeated through every layer of carbon there, leaving a very poor/dry joint. Also not using a flashing tape to heat shrink and compress the components would also lead to a substandard joint. Electrical tape won't cut it.

Post Reply