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Does anyone know the fork length for this frameset? Trying to figure out stack and reach for the various frames. Based on the geometry published, along with a little trig I came up with around 387mm. But I am probably off.

Much appreciated!

yummygooey

wat.

Are you asking what the ATC is? What does that have to do with stack height?

Nagrom_

once again, bout tree fiddy.

Street rider

And that was the fifth time I saw the loch ness monsta

Adrian_

+1

AristoNYC

haha, I forgot about this episode
https://www.youtube.com/watch?v=4qcbg...eature=related

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No, stack and reach of the bike. Stack as in center of bottom bracket to top of headtube. Reach as in center of bottom bracket to center of headtube. You need fork length to determine this.

I suppose I could email a company that is selling this frameset, but figure some people here have this frame and can do a quick measurement for me. Most likely people that own this frame already know this measurement anyway.

Thanks.

Nagrom_

are you asking for headtube length?

and... thats definitely not what stack and reach are... idk wut ur takking buut.

Adrian_

If you email any company asking for that they are all gonna tell you they dont know what you're talking about and cant help you. I cant thing of any reason you would need the measurements you describe.

Scrodzilla

I own both a BK and a shop that sells them and I have no idea what you're getting on about.

The geo chart is pretty thorough:



You do realize the magic number you seek will be different for every frame size, right?

Nagrom_

These aren't the measurements I need scrod.

I need the length of a hypothetical line though the end of the left hand drop out, that tangentially passes through a semi circle centered on the right fork dropout with an arc length equal to the fork rake in radians.

thank you.

Scrodzilla

Oh, well **** me!

Nagrom_

gladly.


wait.

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Fork length. Axle to Crown Length. Not sure how else to say it.

Odd nobody here knows what I am talking about. A good amount of bikes are strictly measured that way (stack and reach). And that is the best way to know how a frame is going to fit. Unfortunately, while the published bk specs are decent, fork length is needed to calculate stack and reach. Pretty sure its 387mm, but just want to be sure.

For those that have no clue...

https://www.slowtwitch.com/Bike_Fit/C...er_One_95.html

Scrod, can you measure the fork length if you get a chance? Please. Thanks.

Scrodzilla

Why didn't you just ask for the axle to crown length? I can measure in the morning, as my BK is at the shop.

diff

Awesome. Thanks scrod.

Adrian_

Do you mind if I ask why you want to fit your bike this way?

diff

Really? It's not obvious to you why those measurements are important? Did you read the article I posted? That will educate you. If you still are still not sure, perhaps speak with a frame builder, or one of the many companies that publish stack and reach measurements right on the geometry page. Here are 2 off the top of my head. They can help you much better than me.

https://www.brooklynmachineworks.com/
https://www.cervelo.com/en_us/

Scrodzilla

Not shooting down your reasons for wanting to know but I have never once cared about that measurement and most likely never will.

Nagrom_

What confused me was how you defined them. Didn't make any sense.

"Stack as in center of bottom bracket to top of headtube."

"Reach as in center of bottom bracket to center of headtube"

Both of these would result in a diagonal line, from the BB to somewhere on the head tube.

Stack is the measurement of a vertical line that runs through the center of the bottom bracket, and intersects an imaginary line that runs through a horizontal line that stems from the top of the head tube.

Reach is the distance from a vertical line through the center of the bottom bracket and a vertical line through the center of the top tube.

Gimme a couple minutes, I'll trig it up, see if we come up with the same answers. What size frame?

Adrian_

I dont think these measurements are important even after reading the article. Though I have worked with a framebuilder to make me a frame that fits me perfectly. Using a free internet fit calculator I might add.

Nagrom_

Also, a not trig formula for stack:

stack = stand over height - wheel radius + bottom bracket drop

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It depends. If I was 100% sure I wanted a bareknuckle I would buy a 54 since I already know that is the best sized bareknuckle for me. I wouldn't be able to straddle a 56, and would have excessive seat post showing on a 52 and have to run excessive spacers and/or a high rise stem to get the bars where I want them.

But what if I have 3 or 4 frames I have narrowed down, and looking for which one is the best fit. Stack and reach is a good way to compare them. Along comparing to my current bike which is dialed in pretty well. At least the best way for me, being in a situation where I won't be able to test ride the frame first.

Scrodzilla

BK/Godzilla sizing is pretty weird when compared to most track frames. I was very surprised when a 54 fit me best, considering I typically ride 56-58cm frames.

It's better to be thorough when choosing, I suppose. I'll measure my bike and post here in the morning.

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Nagrom, the 54.

Only problem is the bottom bracket drop of the bk is only estimated by a few people at 40mm. Also not sure what size tires they used when measuring stand over. Probably 23cm.

Tried again and this time came up with a 363 fork length.

Used a stand over height of 819 for one side, 15 for the angle. Which came out to 847 - 334 (radius of a 700c rim with 23c tire) - 150 (head tube length) = 363 fork length.

Probably doing it all wrong to be honest.

Scrod, I saw your bare knuckle. What is your cycling inseam if you don't mind? Exposed seat post (on non sloping frames) is also a good comparison. Thanks!!