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Old 02-08-12, 01:48 PM   #1
ieyecaptin
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simple question

Hi!
I'm about to purchase a new fork and have been looking online for an explanation of the sizes. I know that I have a 26" 1 1/8 setup, but I don't understand the difference between a fork that is sized 230/65mm or 190/65mm. I'm sorry for the dumb question, but I can't find the answer anywhere.
Thanks!
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Old 02-08-12, 02:08 PM   #2
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Is your headset threadless or threaded? The fork's steerer must be a matching type. I assume the 230 and 190 numbers refer to the steerer length in mm and the 65 mm is the rake.
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Old 02-08-12, 02:18 PM   #3
ieyecaptin
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Thanks, yeah its threadless. I think its referring to the steerer length as well. Thanks for the help!
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Old 02-08-12, 03:51 PM   #4
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Usually there's only one choice for a threadless fork - long, maybe 300-400mm - and the installer is responsible for cutting the steerer to length. When I see numbers like 230/65 for a fork, it would be for a threaded headset, and the 65 means there's 65mm of threading at the top of a 230mm length steerer.

It's not rake. 65mm is too much rake for a normal bike. Rake is almost always between 40 and 50 mm.
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Old 02-08-12, 04:07 PM   #5
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Also,
There are long blade suspension corrected forks.. and those for frames
that were never made to take a suspension fork.

go down to the bike shops and bring your bike, they can see your situation.
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Old 02-08-12, 04:47 PM   #6
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Quote:
Originally Posted by cycle_maven View Post
Usually there's only one choice for a threadless fork - long, maybe 300-400mm - and the installer is responsible for cutting the steerer to length. When I see numbers like 230/65 for a fork, it would be for a threaded headset, and the 65 means there's 65mm of threading at the top of a 230mm length steerer.
Unless these are used forks and have been cut to the advertised lengths. If they are threaded forks, the OP can't use them anyway.

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Originally Posted by cycle_maven View Post
It's not rake. 65mm is too much rake for a normal bike. Rake is almost always between 40 and 50 mm.
That's typical for 700c forks for road bikes. These are for 26" (ISO 559 I trust) wheels and I further assume MTB geometry.
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Old 02-10-12, 10:25 AM   #7
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Maybe the 65 mm is the travel if it's a suspension fork. How about a link to the brand and we could look up the specs from the MFR? 230 or 190 sound right for steerer tube lengths, but I'm at a loss why a new threadless fork would have more than one option of steerer tube length since the installer will nearly always cut the tube to length. I fear that the OP is looking at threaded forks.

65mm could be right for MTB rake, after all. I just looked at an SR suspension fork specified as a 255/130 in the Niagara Cycle catalog that had a 255 length steerer with 130 mm offset (rake) and selectable 100/80 mm of travel. Best look at the manufacturer page for the real information and not trust us internet pontificators.
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