LEXON Road Carbon Crankset

[wintermute]

That is really crazy and unfortunate.  Glad you’re okay.  I’ve been riding my 24mm Lexon cranks pretty much daily.  No issues.  I remember watching a Trace Velo episode where he had a cheap pair of cranks that broke in the same place your’s did.

My biggest gripe with the Lexon cranks is that either their chainrings or spiders are out of spec. I have had non-stop issues with a oscillating chainrings causing minor cage rub on the FD. After switching to a Stone spider and Stone chainrings I was able to eliminate the oscillation.  This was also an issue with my 29mm Lexon cranks.

I may cave and order some Elilees or Cyberei later this year. Your post gives pause about continuing ride on them for safety reasons.


FWIW, I have removed and installed my Lexon cranks multiple times.

I don't know about you, but removing the cranks always felt unpleasant - there was a nasty creak/squeak as the bolt forced itself against the outer cover to pull the crank off.

Frustratingly I suspect Lexon will ignore my messages about this - because I already had a dispute with them over the spacing and spider. Whatever happens, I won't be going back to the system. I got them on the highest sale alongside a code and a refund that made them probably only £120ish total. A replacement pair is over £275. A Cybrei is close to £400.

Red E1's can be had for 299. The only issue would be if you had a frame that couldn't take DUB bearings.

[Da11as]

So I feel like I should make a post on here about this.

Third ride, my lexon 24mm cranks failed catastrophically.

The bolt that holds the crank arm on the left arm sheared off at the head whilst riding; the crank arm came away still attached to my foot. I'm lucky I'm still here. The bolt is clearly made of cheap aluminium (when you hold it in your hand it's way too light).

I suggest everyone checks this bolt for stress risers or fatigue. Similarly, be careful with the torque. It says capable of 45nm. I torqued to 40 and that felt like a lot - obviously too much for this.

Rule of thumb for chineese stuff is to replace excessively light parts with something more robust. I've had uncommon alloy bolts on my carbon cockpit (vedge-type mounting) which came loose very often until I rounded them during quick field fix. Changed them to steel bolts and have no issues since then with only 2g difference.

[biceryder]

I don't know about you, but removing the cranks always felt unpleasant - there was a nasty creak/squeak as the bolt forced itself against the outer cover to pull the crank off.

Frustratingly I suspect Lexon will ignore my messages about this - because I already had a dispute with them over the spacing and spider. Whatever happens, I won't be going back to the system. I got them on the highest sale alongside a code and a refund that made them probably only £120ish total. A replacement pair is over £275. A Cybrei is close to £400.

Red E1's can be had for 299. The only issue would be if you had a frame that couldn't take DUB bearings.

I have had it on and off about 6 times.  No squeaking or noises.  I did grease the threads and head of the bolt with white lithium grease before the first install.  I had squeaking during installation and removal with my 30mm Lexon crank and I’ve ridden that crankset pretty hard. 

[wintermute]

Just because it's maybe of interest; Lexon have agreed to send me a new left arm.

I've asked for a new right crank arm bolt as well in case it was a batch issue.

[Gus]

Just because it's maybe of interest; Lexon have agreed to send me a new left arm.

I've asked for a new right crank arm bolt as well in case it was a batch issue.

Glad they are replacing it, but will you trust to ride the replacement?

[wintermute]

Glad they are replacing it, but will you trust to ride the replacement?

I'm going to leave that up to your imagination!

[LazyCyclist]

I have Lexon, Rockbros, and Cybrei cranks on my bikes, and this bolt does indeed look suspicious on the Lexon. On the Cybrei, it can be torqued up to 50.

[LazyCyclist]

As a side note, the Cybrei has copper grease inside the axle. It should be ideal for an aluminum/titanium combination. I apply it on Lexon and Rockbros as well.

[wintermute]

I have Lexon, Rockbros, and Cybrei cranks on my bikes, and this bolt does indeed look suspicious on the Lexon. On the Cybrei, it can be torqued up to 50.

Hi

Does the physical bolt look different? Do you have any photos of the others to compare?

[LazyCyclist]

To be honest, the photos don’t provide much information. Without disassembly, it’s also hard to identify a specific differences. However, this was the first thing I noticed when I received the Lexon. I’ve had a Cybrei for some time now, and I also use a Rockbros on another bike. The Rockbros is much closer to the Cybrei and also specifies 50 Nm for this bolt. Both my Cybrei and Rockbros are torqued to 50 Nm. With the Lexon - this is just speculation, or maybe my eyes are deceiving me - the thread doesn’t seem as deep as Cybrei.

[wintermute]

To be honest, the photos don’t provide much information. Without disassembly, it’s also hard to identify a specific differences. However, this was the first thing I noticed when I received the Lexon. I’ve had a Cybrei for some time now, and I also use a Rockbros on another bike. The Rockbros is much closer to the Cybrei and also specifies 50 Nm for this bolt. Both my Cybrei and Rockbros are torqued to 50 Nm. With the Lexon - this is just speculation, or maybe my eyes are deceiving me - the thread doesn’t seem as deep as Cybrei.

If you do / can be bothered, you can pop the bolts out by removing the captive end cap with a cassette tool.

No pressure, just curious.

Predicatably Lexon want me to send them £20 in fees to send me a new crank arm 

[pavlo.k]

Does anyone have the RockBros or Carbon Bike Kits 24mm titanium version? I’m wondering if they have the same issues as the Lexon cranks.
Whilst rockbros looks identical, carbon bike kits version seem to at a very least have a different mold for the crankarms and I'm tempted to give them a try

[Sander2177]

Does anyone have the RockBros or Carbon Bike Kits 24mm titanium version? I’m wondering if they have the same issues as the Lexon cranks.
Whilst rockbros looks identical, carbon bike kits version seem to at a very least have a different mold for the crankarms and I'm tempted to give them a try

I have just purchase some cranks from DFS carbon about $285usd 24mm Ti wanting for delivery with some wheels I have ordered.
Peter at XM Carbon speed is also doing these cranks as well they are similar $$.

[LazyCyclist]

If you do / can be bothered, you can pop the bolts out by removing the captive end cap with a cassette tool.

I tried before taking the picture. My lockring key has a weird structure, so there's no proper engagement.

[X5SAE]

Does anyone have the RockBros or Carbon Bike Kits 24mm titanium version? I’m wondering if they have the same issues as the Lexon cranks.
Whilst rockbros looks identical, carbon bike kits version seem to at a very least have a different mold for the crankarms and I'm tempted to give them a try

I do have a the CBK variant in 165 mm and with the 24 mm titanium axle.
To me it looks as if it’s identical to the cybrei cranks. No practical experience, as I just mounted them. The spider is not true, what suxx. But I ordered me a Sigeyi PM spider from AE to swap against the wonky spider.