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Guidelines Riser and Limbs combination
The draw weight of Olympic recurve limbs is always measured on a 25 inch riser. It is generally possible to use limbs on a smaller riser, but consider that there will be a change of draw weight, a general rule of thumb is that for every inch difference the draw weight will change 1 LBS, for example:
Medium (68 inch) limbs with a draw weight of 30 LBS with a:
1) 25 inch riser makes a 68 inch bow with a draw weight of 30 LBS
2) 23 inch riser makes a 66 inch bow with a draw weight of 32 LBS
3) 21 inch riser makes a 64 inch bow with a draw weight of 34 LBS
Also consider that draw weight of ILF limbs are generally measured at a draw lenght of 28 inch, as a rule of thumb you need to add 2 LBS of draw weight for every inch you draw more then 28 inch and vice versa. All this instructions are to be considered as GUIDELINES as the different form and construction of a limb and/or riser can give higher ore lesser results, nonetheless it is a good base to start from.