Measure the axle of the BB on the winter bike? Being 1.5 mm out won't affect things.
I'll try and find it. Hopefully it didn't get chucked when it was upgraded!
Some .5 mm spacers with the standard chain ring bolts will get yer chain line as spot on if you're that concerned.
@Paul8vv started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Measure the axle of the BB on the winter bike? Being 1.5 mm out won't affect things.