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Harley-Davidson Model
Downtube Frame Size Chart
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Use this quick chart to determine which size downtube your bike has based on what model letters it has.
This is just a guide so it is always best to measure your bike's downtube diameter to be sure to get the correct size oil cooler.
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Harley-Davidson 'Model Family'
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Downtube Diameter
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Dyna Family (FXD)
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1 1/4" - 1 1/2" Stepped Dia.
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Softtail Family (FXS & FLS)
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1 1/8" Straight Dia.
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Sportster Family (XL)
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1 1/4" Straight Dia.
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Touring Family (FLH & FLT)
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1 1/8" - 1 1/4" Stepped Dia.
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