New or replaced tube punctures quickly
Inspect rim tape, check for sharp debris/glass. Confirm correct tube/tire size. If new tube fails, they may replace under warranty per attached policy.
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Tube fails shortly after starting use
Inspect for production flaw vs. puncture. Replace tube; request warranty replacement if obviously defective (not regular puncture).What is Head tube angle, seat tube angle, stack, and reach of D35 and ST
Please refer to the following table for the head tube angle, seat tube angle, stack, and reach values. A= Reach B= Stack C=Head tube angle D= Seat tube angle A B C D D35 – 20’’ 400mm 682mm 71 72.6 D35 – 18’’ 377mm 681mm 71 72.6 D35 – 16’’ 331mm ...Flats soon after use or trouble removing/installing tube
Inspect for rim strip misalignment or tire bead issues. Use proper tire lever technique; if tube seems defective out of box, contact ENVO with photos for replacement.Battery stops charging or discharges quickly
Try another charger. Test battery on different D50/ST50 if possible. If battery at fault and <1yr, contact ENVO for warranty.New bikers struggle with complex assembly
Follow unboxing video closely. Complete each step before moving to next. Seek professional help if stuck.