On brake pads and sprockets
Hi,
On brake pads - Sorry to disagree with previous poster, but my experience is that on dirt or gravel roads, brake pads wear down very much quicker, especially if as you say you are hard on the brakes. I would not bank on more that 4000 miles, and would always have a spare set for front and back with me. There is also the sintered pad material vs organic pad material decision. Sintered last longer but ware the disc out more quickly (but not likely to cause the disc to be replaced during your trip, I guess).Many prefer the feel of sintered too.
On sprockets - I would consider just carrying a spare front sprocket, and a few tab washers for its nut, if it uses that system. Assuming that your chain size isn't unusual, obtaining a replacement chain shouldn't be too difficult. Chances are the rear sprocket will fit a few makes and models and you stand a chance of finding that too.(worth doing a bit of research on this though). And if it is flat, as a last resort you can just turn it over as most of the ware will be on the driven side of the teeth. The front sprocket probably doesn't fit any other makes, making the chances of finding something from another bike that fits much less likley. And being much smaller than the rear wears down a lot more than it, and often has a shoulder that prevents them from being turned over anyway, so I carry a spare one. Plus its quite small.
Hope this helps.
Mark
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