Yeah, grab a spare frame—if it’s still straight, you’re good. Strip out the old tires, keep the rim, then bolt a lightweight carbon or even a steel tube across the top to keep the weight low. Use a single‑spoked wheel or a bike tyre on a skateboard wheel for a slick glide. Tape any weak spots with duct or velcro to patch up cracks, and sling a small stash of tools in a zip‑lock bag on the back rack. Keep the handlebars low and angle them back a bit so you can see through the alley and still be ready to flip the bike around. That’ll give you that lean, scavenger‑ready vibe without adding too much bulk.