Front is stock 15... swapping to a 17 is almost like circumcision, should be done at birth as it makes the gearing much taller.
With the 15 tooth stock I'm in 2nd gear before I leave my driveway
If you swap the rear, I suppose you may need to make adjustment to your chain (remove links etc. )
15 swap to 17 required no chain alteration or replacement, stock chain worked fine ...for now ( cue in suspenseful music )
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