I have about 4000 miles now on the Trek District 4 Equipped I bought new last year, and I think I've now had five or six broken rear spokes. It has a Shimano Alfine 8 rear hub laced to a Bontrager rim with 32 straight gauge spokes, and has 700C x 40 mm tyres.
The shop has been great at replacing them under warranty, and last time they even got Trek to give me a new rear wheel on the theory that maybe it was built wrong. Well, that was less than six months and 1500 miles ago, and I've just dropped it off again when I found another broken one. They all break at or just inside the nipple, with a few threads left on the spoke.
I bought the bike in late March of 2023, so I have about six weeks of warranty left. I am well, well under the weight limit for the bike at about 165 lb / 75 kg, have never used it for heavy loads, and about the roughest thing I do to it is slow rides up or down 6" dropped kerbs. I also don't put out massive power, especially when I ride this bike, which is mainly my commuter. Any thoughts? I'm not looking to return the bike. My thought was once it's out of warranty I'll just rebuild it myself with quality double butted spokes and upgrade to brass nipples, probably $50 (£40) per wheel if I do the labour myself. I told the shop owner that, and he assured me they "won't let it get that far."
My intent with this bike, with its belt drive, internal gears, and generator lights, is it would be an unstoppable 100% reliable pub bike to get me home at night without any mechanical issues, and to be fair it has been. Even with two broken spokes there was enough chain stay clearance to handle the wobble.
Any theories as to what the cause might be other than "maybe the spokes aren't strong enough?"
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