Drop Gears

Drop Gears

MED S/C DROP GEARS - INDIVIDUAL

£65.00 £54.17 EXC VAT
Replacement MED straight-cut drop gears for individual replacement/upgrades.
£65.00 £54.17 EXC VAT
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Description

If you already have one of our high performance straight-cut drop gear sets and require a change of ratio, a change of engine type or just some spares, we can supply any gear from the kits separately.

We can supply;

  • 1275 primary gear - 23 or 24 teeth
  • 998 primary gear - 23 or 24 teeth
  • Standard pin type idler gear - early or late type
  • Roller bearing idler gear - early or late type
  • Input gear - 23 or 24 teeth

Please note that spares are only compatible with the straight-cut MED gear sets.

All are interchangeable within the sets, so you can upgrade to a roller bearing idler from a standard pin type, or change idler and primary gear ratios.

Additional Information

The MED drop gear sets are available in three different ratios, which can be used to tweak the final drive ratio. Changing the effective final drive ratio will either improve acceleration or top speed potential, although one will always come at the expense of the other.

We can do this by changing the tooth count on either the idler gear or primary gear to 23 or 24 teeth. The idler gear in the middle remains at 30 teeth regardless.

The table below shows the various tooth counts and the effect on the drop gear ratio:


 

               Drop gear set configuration               
  1:1 1:1.043 1:0.958
Input gear 24 teeth 24 teeth 23 teeth
Idler gear 30 teeth 30 teeth 30 teeth
Primary gear 24 teeth 23 teeth 24 teeth

To calculate your effective final drive ratio based on the above, simply multiply your existing final drive ratio by the number of the drop gear set. So for example, a 3.47:1 final drive ratio with a 1:1.043 drop gear set then becomes 3.62:1. Remember that the higher the number, the shorter the gearing will be, so this change will result in a higher engine RPM for a given speed.

Changing the primary gear is easier than removing the differential to change the final drive ratio, so racers use this to adjust their gearing to suit different circuits. Keeping an engine in its peak powerband for longer will result in a faster lap time.

See the following table for our final drive conversions using the various drop gear sets:


 

               Drop gear ratio adjustment               
Original 
final drive
With 1:1.043
drop gears
With 1:0.958
drop gears
3.47:1 3.62:1 3.32:1
3.75:1 3.91:1 3.59:1
3.875:1 4.04:1 3.71:1
4.066:1 4.24:1 3.90:1
4.2:1 4.38:1 4.02:1
4.5:1 4.69:1 4.31:1

 

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SPECIALIST

Leading A-Series engine specialist since 1981

HIGH QUALITY

High quality components with a 4.8 star average rating

EXPERTS

Expert technical knowledge of the A-Series engine

DELIVERY

Express daily shipping services to customers worldwide

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SPECIALIST

Leading A-Series engine specialist since 1981

HIGH QUALITY

High quality components with a 4.8 star average rating

EXPERTS

Expert technical knowledge of the A-Series engine

DELIVERY

Express daily shipping services to customers worldwide

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