I have some questions about the Bontrager rims that come with the FX Sport series bikes that I'm hoping can be answered here. Going by just the TREK (US) website, the FX Sport 4/5 have the "Bontrager Tubeless Ready Disc" wheels with "Formula alloy" hubs while the FX Sport 6 is equipped with the Bontrager Affinity Tubeless Ready (disc) wheels with "Bontrager alloy sealed bearing" hubs. What's the primary difference between these two wheelsets (e.g., weight, hub efficiency, durability, etc.) besides the graphics? Personally, I think the Affinity rims look cooler with the larger Bontrager type, but performance-wise, what's the actual difference? Does anyone know the specific details. Also, if one purchased an FX Sport 4/5 can an LBS order/install the Affinity rims over the stock rims? TREK doesn't appear to list the Affinity wheels on the website as an item that can be purchased (at least by a consumer), but I'm aware they don't list every single item an LBS is able to order/sell directly to a customer. StuBerger has the Affinity wheels on the FX Sport 5, and I've seen some pics of FX Sport 4s online that also have the Affinity wheelset so maybe it's possible? Thanks for the info.