I've gotten decent at installing the inserts but this absolutely broke me. DD casing on the rear... Just couldn't get it. Whatever, I'm sure it'll be fine.
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Try the Bead Bro yet?
Bead Bro - Cushcore
It’s Simple. It’s Effective. It’s your Bead Bro. Holds the bead down in the rim channel, allowing you to use both hands to complete the remainder tire installation – It’s like having a third hand. Locks bead to the rim using a rubber bumper – won’t scratch or damage you rim. Designed for any rim...
cushcore.com