so long as you know the internal ratio of the car, then the easiest thing to do would be to go to gearchart.com & print off a chart to use as a crib sheet. the MI1 should be already listed on the site as a Schumacher mission which should be the exact same ratio.
Although (not sure if this would be relevant) i do remember from my Mi2 days the car had 2 gearing configurations due to an option of using a 20 & a 17 layshaft pulley which does affect the internal ratio.. as the Mi2, was a newer / improved version of the Mi1 / Mission, i'm not sure if it uses the same layshaft arrangement as i've never owned an Mi1 or studied the manual enough to know how it works. The general feeling with the Mi2 was on 48dp run (the standard gearing) go with the 20t pulley, but if switching to 64dp spurs/ pinions, then fit the 17 to give you more fine choice of ratio's.
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