![Image](http://www.qualitysmart.com/products/ironman/images/sprockets/ironmansprockets.jpg)
But my XR650 has an aluminum Renthal.
So today I'm out riding my Hondapotums with Eric and Pecker, we stop... and I notice my chain is tight.... really tight.
It wasent like that when we left.
![Question :?:](./images/smilies/icon_question.gif)
![Question :?:](./images/smilies/icon_question.gif)
![Question :?:](./images/smilies/icon_question.gif)
![Question :?:](./images/smilies/icon_question.gif)
![Question :?:](./images/smilies/icon_question.gif)
So I get home and its still tight. I go in and have dinner and come out to readjust it.... and now its fine.
Question? Could the heat of high speed riding cause the aluminum sprocket to expand enough to tighten the chain, which would cause even more heat, leading to even more expansion and increased tightness?
Weird, huh? Another reason to run steel sprockets......