‘23 V4S stock forged wheels vs BST wheels

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About my 4th or 5th track day I ran off the track at streets of willow and ran over small boulder sized rocks weighing 260-270 pounds in gear at the time…my thysenkrupp amazingly handled it just fine…the barrel on those is braided CF and VERY strong, they make the OEM wheels for Porsche and have to withstand that rigorous OEM DOT testing. BST probably hold up well too, but those Rotobox wheels I’d stay away from, heard many stories of them cracking.

Point being, CF wheels are like any other product, if engineered and built well they are VERY durable.
 
SBK-SP said:
I’ve bought BST carbon wheels for 4 of my bikes, the other has non-DOT OZ forged race wheels because BST are not available. Unless you’re a ham-fisted goon you WILL notice the difference, especially in turning, when changing from forged marchesini to BST carbon. Thyssenkrupp are hideous. Are they “worth the money”? Only you can make that call. I tell people NOT to try carbon wheels unless they’re ready to swap all their bikes to carbon. After riding on carbon for a while and switching back to forged, it will feel like a tank.
Click to expand...
I'm sorry you bought them. You won't feel anything with BST wheels vs OZ forged. If you say you're you're just delusional. You can't even prove it with telemetry data.
 
Sorry Baggers and Pani but you are both wrong, one scratch or a bit of rim damage does not ruin a carbon wheel. You need to understand the material, it's FRP or fibre reinforced plastic i.e its the fibres that give the strength and they are simply held in position by the resin. The resin is relatively weak and has very little strength, but if you scratch carbon nothing happens unless its a deep gouge that crosses multiple layers of fibre in a critical area. The rim is at the extremity so a scratch there is not going to affect it at all, you have to look at the load path. Carbon does not flex, it's failure mode is catastrophic i.e its works until it doesnt and all wheel manufacturers have considerable safety margins so I wouldnt worry about failure. On the tyre changing front the only thing you have to worry about is point loading and understanding that you are dealing with a hard resin (plastic) material not metal. Carbon is nuts strong, you would work harder to smash a carbon wheel with a sledgehammer than a metal one.

The problem with carbon wheels it that they dont hold heat like metal so you have to work to keep heat in the tires, they are illegal in most racing organisations, they are stupid expensive, if you overheat a disc which I have seen several times on the rear due to master cylinder issues, then you really could lose the wheel. But the biggest problem is for the Starbucks crowd with anal retentive cosmetic habits on their bikes, one scratch and they're toast so it's better to display rather than ride.

btw BMW oem Thyssenkrupp's had spoke to rim fractures, but think thats fixed now.
 
Steven31371 said:
About my 4th or 5th track day I ran off the track at streets of willow and ran over small boulder sized rocks weighing 260-270 pounds in gear at the time…my thysenkrupp amazingly handled it just fine…the barrel on those is braided CF and VERY strong, they make the OEM wheels for Porsche and have to withstand that rigorous OEM DOT testing. BST probably hold up well too, but those Rotobox wheels I’d stay away from, heard many stories of them cracking.

Point being, CF wheels are like any other product, if engineered and built well they are VERY durable.
Click to expand...

TK wheels are made using resin transfer moulding and braided continuous fiber which in my opinion is superior to pre-preg layup in harsh environments. It’s stronger and more resilient at the cost of a little more weight. An added benefit is that voids are virtually eliminated in the rtm process.

That being said, for a TRACK bike forged aluminum all day. Cheaper. Just as durable. Light enough. If they’re good enough for Michele then they’re good enough for me.

Let’s be honest, fancy wheels are the least of your problems for a trackday rider.

IMG_0473.jpeg
 
Seems like most who have the carbon wheels like them.

I would think the carbon would hold up strength wise compared to the forged aluminum when in a situation like hitting a pot hole ect.

If the carbon is stronger as a material , what might dent and bend an aluminum wheel might not crack a carbon wheel . But on the other hand , what would definitely crack a carbon rim would definitely destroy and V bend an aluminum one as well.
 
Paul G said:
Sorry Baggers and Pani but you are both wrong, one scratch or a bit of rim damage does not ruin a carbon wheel. You need to understand the material, it's FRP or fibre reinforced plastic i.e its the fibres that give the strength and they are simply held in position by the resin. The resin is relatively weak and has very little strength, but if you scratch carbon nothing happens unless its a deep gouge that crosses multiple layers of fibre in a critical area. The rim is at the extremity so a scratch there is not going to affect it at all, you have to look at the load path. Carbon does not flex, it's failure mode is catastrophic i.e its works until it doesnt and all wheel manufacturers have considerable safety margins so I wouldnt worry about failure. On the tyre changing front the only thing you have to worry about is point loading and understanding that you are dealing with a hard resin (plastic) material not metal. Carbon is nuts strong, you would work harder to smash a carbon wheel with a sledgehammer than a metal one.

The problem with carbon wheels it that they dont hold heat like metal so you have to work to keep heat in the tires, they are illegal in most racing organisations, they are stupid expensive, if you overheat a disc which I have seen several times on the rear due to master cylinder issues, then you really could lose the wheel. But the biggest problem is for the Starbucks crowd with anal retentive cosmetic habits on their bikes, one scratch and they're toast so it's better to display rather than ride.

btw BMW oem Thyssenkrupp's had spoke to rim fractures, but think thats fixed now.
Click to expand...

I did not know this. Scratches would normally crack propagate but not from anywhere the tire guys would have caused a scratch. I've been leary about carbon stuff since a guy broke a carbon fiber swingarm in front of me in the g-out that was (is?) on the backside of Buttonwillow. That cold tire thing never crossed my mind. Thanks.
 

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