You should look at this before buying carbon bicycle rims from china



bruce_cycling

New Member
Feb 17, 2017
3
0
1
Hi guys, how's everything going with you? I would like to share some carbon bicycle rims knowledge with you, hope it can help you make a right decision when buy carbon rims from China.

The traditional production technology used EPS foam preform technology to produce the rims, one drawbacks of this kind of technology is the EPS foam inside the rims, in order to take the foam out and remove the debris, workers need to open lid on the rim( as the following picture shows),
Open Lid Carbon Rims.png

Problems for Bad Rims.png

the rim will break easily because of the opened lid when tire pressure or temperature is too high.

As the development of production technology, most factories have abandoned this traditional technology and used a new technology, called one-time moulding technology, which can add more strength and beauty to the rims, the average compressive strength without opening the lid is more than 20% compared to the open lid.

Another important point is the production of tire channel. In order to save cost, some factories will use Silicom moulding technology to produce the rim, which have obvious cut on the tire channel,it will easily cut the tire and make the thickness of brake surface uneven and make the wheel unstable, while professional manufacturers will use three pieces technology (as the following picture shows)
rim difference.png
Three pieces.png

to make the tire channel,which can make rims more beautiful and stronger.

What's more, in order to control the quality of carbon rims, professioal manufacturers will do a lot of tests,such as spoke tesion, brake surface, rim roundness and flatness tests when rims are finished, as the pictures shows.
Carbon Rim Production.png
Rim Test Methods.png


Welcome to share any bicycle knowledge with me, wish you have a nice day! :)
 

Attachments

  • Three pieces.png
    Three pieces.png
    156.3 KB · Views: 22

Froze

Well-Known Member
Jul 13, 2004
4,711
756
113
NE Indiana
interesting. So, being a brand spanking new member and a first post for you, tell me something...what ulterior motive do you have for posting what you did? Do you own a carbon wheel manufacturing company?
 

bruce_cycling

New Member
Feb 17, 2017
3
0
1
interesting. So, being a brand spanking new member and a first post for you, tell me something...what ulterior motive do you have for posting what you did? Do you own a carbon wheel manufacturing company?
I worked for a bicycle company before and have my own carbon road bike, just want to share some information. :)
 

Froze

Well-Known Member
Jul 13, 2004
4,711
756
113
NE Indiana
There's nothing wrong if you owned a CF wheel company, if you did then you would first need to submit a request the moderators of this forum to post, and they would probably let you in the right section.

What bicycle company did you work for? for how long and how long ago? Nosey...err I mean enquiring minds what to know!
 
  • Like
Reactions: Kakashi