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Thanks, Woody. I'm in the US, so I'll have to see if In Motion can ship to me. I will search for a US source as well. We have a rather "fluid" tariff situation and now the "de minimus" exemption has been rescinded which means small shipments (like a sprocket and a nut) go through the same process as a cargo container of goods. If worse comes to worse, I can machine a special nut as I'm fortunate to have a nice machine shop. Finding a sprocket will still be a challenge as I have not had experience with machining internal splines... may have to learn. Again appreciate your knowledge and generosity to share it.

Hi, this is really helpful. I want to reduce the gearing on my '72 MAR, and the 10T front seems like a good idea, but I wasn't sure what "chain riding over the boss" meant. Is there something that the smaller radius causes it to hit in the case under limits of suspension travel? Also, good sources for sprockets would be useful. I'm new to this...