Just a cheap tire mod that fits the stock axels and use the original bearings, use Ali tires like these (63 out and 52inner 26 wide all mm). It's a tight fit so some sanding could help for better fit. latest version is a bit less wide than previous because adjusted... looks and fits better now. Also print some bearings ( https://www.thingiverse.com/thing:3057996 ) as shims between the axel and the front tire. order of placement shim, bearing, rim and bearing. with the new version it should be ok without the shims
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