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Any idea how long the 428 chain would last on the street? I would like the chain to last at least as long as the aluminum sprocket.
The, most likely, aluminum sprocket is gonna have a significantly shorter lifespan than the stock steel ones. If you buy an X or O-ring 4xx-series chain then it should last as long as the sprockets I would think. The non-o-ring chains for racing are dependent on alot more chain cleaning and lubing and don't last nearly as long but, they make some worthwhile trade-offs.Any idea how long the 428 chain would last on the street? I would like the chain to last at least as long as the aluminum sprocket.
Well for sure you wouldn't want to use a crapy chain, but if you use the MotoGP Moto3 level chain (DID ERZ) it would be fine. Having run one of these setups on the Mito for several years I can say that it's not a big deal to keep it in shape on the street. These chains are expensive though. Close to $90. It's the same chain that you'll see run on all the Moto3 bikes, and on the previous 125 class. These bikes produce significantly more power and stress than the 390. If they aren't breaking chains all the time why would you expect it to be an issue with the 390? And again, I'm not talking about a 415 BMX chain, or some crapy chain.
The reason it is a big deal with regards to performance is pulling that chain makes a big difference on the smaller lower powered bikes. You probably wouldn't even ever notice it on the liter bikes because well, you probably never ride them at or near their full potential (there's no place safe to do so on the street). But the little bikes are much easier to push to their potential, and you would be more likely to realize significant benefit. On the Mito it was very noticeable.
DID 415ERX120 LINKS | Products | Parts Unlimited®
so still no one make a 415 drive train for racing?
the 428 chain seems like a good option. I'm worried about durability on the 415.
Still working with the company to get everything sorted out on the 415 kit. I received the kit on Saturday but the manufacturer messed up cutting the teeth/grooves in the center of the front sprocket, so they are having to remake them. Sounds like they are about 3 weeks out, right now. I will update more when I can.
Yo - let me know when you test this. Interested.