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The time is coming near

Discussion in 'XJ Technical Chat' started by 81seca550, Apr 12, 2010.

  1. 81seca550

    81seca550 Member

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    The time is coming near where i am going to oder a new chain and sprockets.

    Im having a hard time figuring out how i should gear it. i believe ride now its 14-45. not stock for the 81 550. I do ride on the highway a lil bit but im looking for a miture of acceleration and somewhat low cruising rpms.

    I think the stock gearing for the 81 550 seca was 15-46 correct me if im wrong. Would i notice much in acceleration if i i went to a 15-46 gearing?
     
  2. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    Stock gearing for an '81 Seca 550 was 16T front/46T rear.

    Stock gearing for the '82 and '83 Seca 550 was 16T front/45T rear.

    From chacal's 'catalog' forum, middle of page 3:

    "For a quick performance comparison, here is a chart of the various combinations of drive ratios available using any combination of either a 15-, 16-, or 17-tooth front sprocket along with either a 44-, 45-, or 46-tooth rear sprocket:

    15 front and 46 rear = 3.0667-to-1 ratio (fastest acceleration)
    15 front and 45 rear = 3.0000-to-1 ratio
    15 front and 44 rear = 2.9333-to-1 ratio
    16 front and 46 rear = 2.8750-to-1 ratio (stock 1981 XJ550 Seca)
    16 front and 45 rear = 2.8125-to-1 ratio (stock 1982-3 XJ550 Seca and all XJ550 Maxims)
    16 front and 44 rear = 2.7500-to-1 ratio
    17 front and 46 rear = 2.7059-to-1 ratio
    17 front and 45 rear = 2.6471-to-1 ratio
    17 front and 44 rear = 2.5822-to-1 ratio (highest top speed)"

    From experience, other than about 200rpm at highway speed, there isn't much of a noticeable difference between the 16/46 and 16/45.
     

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