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What is meant by term 'RC' & 'FC' in case of a bicycle frame

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What is meant by term 'RC' & 'FC' in case of a bicycle frame

Old 08-23-17, 04:26 AM
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kloud
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What is meant by term 'RC' & 'FC' in case of a bicycle frame

I came across a engineering drawing for one of the bicycle alloy frames (MTB).
There was mention RC distance on the drawing from BBS centre till the dropout dead centre towards rear and FC distance from BBS centre till imaginary fork dropout dead centre.

Can anyone tell me what is the full form of "RC" and "FC".
I know that totaling both the dimensions gives us wheelbase.
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Old 08-23-17, 05:10 AM
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FC is "front center". RC is "rear center". They indicate how the bike is balanced and rider weight distribution since most riders will always establish a fixed saddle position relative to the bottom bracket.
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Old 08-24-17, 07:27 PM
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Originally Posted by kloud View Post
I know that totaling both the dimensions gives us wheelbase.

Totaling RC + FC does not exactly result in wheelbase, unless the frame has 0 bottom bracket drop. Close but not quite a cigar.
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Old 08-24-17, 08:58 PM
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"Front center" is the distance from the bottom bracket to the front wheel axle. "Rear center" is the distance from the bottom bracket to the rear wheel axle.

Adding them together doesn't give you wheelbase unless the bottom bracket sits on a line between the two wheel axles; generally the bottom bracket is below that line, so FC+RC gives you something slightly bigger than the wheelbase.
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Old 08-24-17, 11:45 PM
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kloud
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Originally Posted by Wildwood View Post
Totaling RC + FC does not exactly result in wheelbase, unless the frame has 0 bottom bracket drop. Close but not quite a cigar.
Hello Wildwood

Yes, my bad. I forgot to mention that the frame had near about zero BBS drop/raise.
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Old 08-25-17, 12:25 AM
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Originally Posted by rpenmanparker View Post
FC is "front center". RC is "rear center". They indicate how the bike is balanced and rider weight distribution since most riders will always establish a fixed saddle position relative to the bottom bracket.
Originally Posted by HTupolev View Post
"Front center" is the distance from the bottom bracket to the front wheel axle. "Rear center" is the distance from the bottom bracket to the rear wheel axle.

Adding them together doesn't give you wheelbase unless the bottom bracket sits on a line between the two wheel axles; generally the bottom bracket is below that line, so FC+RC gives you something slightly bigger than the wheelbase.
Thank you everyone!
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Old 08-25-17, 04:04 AM
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RC means you got the BH Ultralight model that isn't light at all.
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