Where do you pair the L508? Is it the main onelapfit app or is there a separate app I can't find? I can't pair the L508 at all in "other devices > smart tail light"
My C606 pairs fine, and when I got low battery warning it said "FRONT smart light battery low" but it's not under front light either

You need the "Magene Utility" app. Yeah, it's separate from the OnelapFit app. 

Merlin UK's price for HG54 is 9 something USD, but out of stock.  for 15, they have HG95s on sale.

https://www.merlincycles.com/en-us/shimano-xt-hg95-10-speed-hgx-chain-49366.html

Merlin charges $31.50 to ship by UPS to the US. But in the past I have used LordGun in Italy for a pair of GP 5000 tires. They only charge $13.41 for UPS and I got it in 2 days.

How many of you guys had this happen? Almost all of my bikes are running *supposedly* fake, cheap Aliexpress chains with one of them at close to 6k miles with some left still. I'm talking about KMC and Shimano chains.

I bought an $11 Shimano HG54 10 speed chain from AliX and it did indeed rip past 0.5% in just 2 months (probably <200 miles) so I returned it and got a full refund. But then I've also bought other chains and brake rotors from AliX and they've been completely fine. So it's a bit of a lottery, and now I try to stick to specific sellers that I know are okay.

bike looks great, been looking at the same frame...can see you have a 52 how tall are you?

I'm 5'7" or 170 cm with a 78-79 cm in-seam (barefoot, floor to crotch). You can compare fitment to a Tarmac SL7 of course, but you may see some discrepancies depending on if they measure the stack and reach of just the frame (BXT) or with the mandatory transition spacer (the Tarmac lists this separately as Stack and Reach to Stem). Also, I did have to cut the seat post because you must not let it go down to the part of the seat tube that has the indent for the rear wheel.

Got it from AliExpress, BXT Official Store. Chameleon paint so it's brown in direct sunlight, green when the sun hits it at an angle, and pretty much black in low light. I requested a smaller BXT logo on the top tube instead of the down tube, and no headset label and they complied. It took 18 days from order to delivery by FedEx, which they asked me to pay $40 extra for.

The 52 cm frame weighed 962 g with no bottom bracket, headset or axles, but with the front and rear derailleur hangers. The fork weighed 408 g after I cut it. Final build weight 8.8 kg/19.4 lb. It's really just a spare parts bin bike so I didn't put any effort into reducing weight.

The groupset is Tiagra 2x10 speed with hydraulic disc brakes, but with a 105 FD-R7100 front derailleur because the frame only has a large hole for a front derailleur cable with outer housing. Oh and you only get a grommet for the rear brake hose. No grommets for the rear or front derailleurs or front brake. The integrated handlebars were a real pain to do with 4 hoses, but I think it was worth it for the clean look. The gloss black handlebars show scratches easily, but I was able to polish them out by hand.

The top headset bearing didn't quite sit flat. It rocks a bit forwards and backwards. But I got it to stop rocking by tightening it while pulling the frame back against the front brakes. Also the included T47 68 mm bottom bracket was very tight for my Tiagra crankset. I actually knocked the non-drive side bearing out while attempting to tap the crankset in with a mallet. I got the bearing back in but I'll probably just order a new bottom bracket.

Overall I'm very happy with this bike.