Can you feel that? There's s a RUMBLE and GRIND in the drivetrain! But which part? Calvin is on the case, and searching for answers one piece at a time. Will his trained eyes and ears yield results? Or, will Calvin's investigation GRIND to a halt?

➤ Fix It:
Did you know that Park Tool is the #1 resource for bicycle repair education?
• Visit our YouTube Channel:    / parktool  
• Visit the Repair Help section of Parktool.com: https://www.parktool.com/repairhelp
• Check out The Big Blue Book of Bicycle Repair: https://www.parktool.com/product/big-...

➤ About Park Tool:
Since our founding in 1963, Park Tool has been the leading name in bicycle tools. Our YouTube channel is an extension of our mission to be the ultimate resource for mechanics and riders of all skill levels. Here you will find comprehensive repair help tutorials for a wide range of components and processes, as well as troubleshooting guides, tips and tricks, and information on the latest Park Tool products.

➤ Subscribe: https://www.youtube.com/user/parktool...
➤ Like:   / parktool  
➤ Follow:   / parktoolblue