6 votes

Reconciling the two aspects: carbon is stiffer for power, but offers a softer ride

A simple explanation I've heard is that metal tubes are isotropic - their material properties are identical in all directions (tube shape and thickness being constant). Carbon fiber can be made ...
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  • 20.7k
5 votes

Is this a crack? Came off my Carbon frame for the first time

While one can't really be certain without performing an X-ray inspection, I think it's pretty safe to say this one is just a paint chip. The two later-added photos show the location and size of the ...
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  • 11.4k
4 votes

Possible damage in carbon fork of used road bike I'm about to buy

To me it looks like a very shoddy job of quality control initially, or a poor repair that has been painted to match the bike. I'd suggest comparing the paint on both sides of the fork to see if there'...
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  • 101k
4 votes

Carbon fork - removed exapnder plug before loosening stem

There's some distant hypothetical chance of damage from this, and it should be avoided, but it's almost certainly fine as long as no damage is apparent (cracking, delamination or separation of layers, ...
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3 votes
Accepted

Carbon fork - removed exapnder plug before loosening stem

There are various designs of expander plug on the market, both those supplied by fork manufacturers and others made by hardware and other component companies such as FSA. They reach various depths ...
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  • 10.5k
3 votes
Accepted

Canyon Endurace CF 8: expander vs compression ring

If I'm understanding right, you've got an upper headset bearing compression ring that you don't trust is dimensionally stable, and the headset keeps coming loose. It is true that janky plastic ...
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2 votes

Reconciling the two aspects: carbon is stiffer for power, but offers a softer ride

Depending on how the carbon fibres are laid up, the flexibility can be altered by a huge amount. Different fibres such as kevlar and glass can be added to the mixture to increase flexibility in areas ...
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  • 10.5k
2 votes

Where do I locate/install the compression plug for my stem in my carbon steer tube?

With a carbon steerer tube, you generally want to have the compression plug placed within the area where the stem would clamp. The general idea is that the clamping force of the stem has a solid ...
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  • 2,041
1 vote

Carbon fork - removed exapnder plug before loosening stem

I would quantify the risks differently from Nathan. Remember that the fork steerer is hollow. The compression plugs support the walls of the steerer from inside against the stem's clamping force, ...
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  • 20.7k
1 vote

Possible damage in carbon fork of used road bike I'm about to buy

I don't want to be the naysayer but the fork exhibiting the same flaw in both sides in the same place and being the type of construction it is, I would very strongly advise you to consider replacing ...
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  • 10.5k
1 vote
Accepted

Reconciling the two aspects: carbon is stiffer for power, but offers a softer ride

Looking at the stress-strain curves, aluminium is a very stiff material, especially when you design the frame to stay in low stress regions for good life expectancy. This usually means that you have ...
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  • 20.5k
1 vote

What should the torque of an expander plug in a carbon fork be?

The expander plug has no load to bear. After the steering has been adjusted and the stem clamped you could theoretically remove the top-cap or at least loosen the bolt. In the early stages of ...
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  • 8,165
1 vote

What should the torque of an expander plug in a carbon fork be?

You use the manufacturer specified torque, which in this case is max 8 Nm but in another component it could be different. That value sounds like more than we are used to in this area of the bike, but ...
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  • 12.1k
1 vote

Hylix carbon fork and compression plug

Some things to consider: The plugs only purpose is to be strong enough to not move up when you tighten the headset down. The steerer will be clamped by the stem, so the stem will reinforce the ...
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  • 3,182

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