6K custom made drive rim made by 6K products in the USA.
DS0250 8 slot rim – will increase chain speed by approx 10%
DS0246 9 slot rim – will increase chain speed by approx 30%
DS0247 10 slot rim – will increase chain speed by approx 43%
Caution – do not look to swap rims unless you are an experienced lo pro ripping chain user. Using a larger rim may mean you have to increase the drive link count by a link.
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basket ![DS0250 6K Lo Pro Drive Rim St Internal Driving 3/8 Lo Pro Chain [8 Slot]](https://www.chainsawbars.co.uk/content/uploads/DS0250-6K-Lo-Pro-Drive-Rim-St-Internal-Driving-38-Lo-Pro-Chain-8-Slot.jpeg)

![11250071001 Stihl .325 x7 tooth Rim and Sprocket [Stihl MS290 Non Standard Option - Standard Option is 3/8]](https://www.chainsawbars.co.uk/content/uploads/11250071001-Stihl-.325-x7-tooth-Rim-and-Sprocket-Stihl-MS290-Non-Standard-Option-Standard-Option-is-38-350x263.jpg)