It goes tight when stationary and backpedalling (backpedalling normally slackens a chain) and sloppy when forward pedalling?
Imlach's Sweaty Hippie Funk Collection, adventure bikes, rusty rats, cruisers and other alt bastardisations of bicyclery
That's a good point, a very skewed chainline can make the chain kind of knot up when backpedalling. But I don't see why it'd be tight when no rotation and then sloppy once he begins pedalling
grey-beard
Orange 🍊 Fan
Chain line is spot on. I'm still suspecting that BMX chainring. It's a single bolt fixing and I reckon there's play in it. So it's isn't perfectly central on the bottom bracket.
About a ring being out of round, it's quite rare that chainrings aren't a bit out of round, so it isn't something I'd worry about. It's just important to set the chain tension on the tightest spot, but what you're describing sounds like a completely different symptom and I'm scratching my head.
grey-beard
Orange 🍊 Fan
It turns out that I am missing a part?
One of these
Crank Top Hat Washer
• Adaptor that makes your sprocket fit your crank centre. • 23.8 to 19mm, 23.8 to 22mm. Short sizes for thinner steel sprockets and spiders Long (Regular) sizes for modern alloy CNC sprockets Sprockets like the Haro Team Discs and Uni-Directionals use the Short sizing.
alansbmx.com
Source:
www.mtb-news.de
Bike der Woche powered by bike-components: Leaf Cycles Klunker von IBC-User sevenfilms_micha - MTB-News.de
Heute begeistert sevenfilms_micha mit seinem Bike der Woche. Das Leaf Cycles Klunker ist der perfekte Begleiter für Trailbau-Einsätze!
www.mtb-news.de
Guinessisgoodforyou
rBotM Winner
That is stunning. Bar a few detail changes for my taste 
