Topsey

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4/15/2014 4:58 PM

or other person with knowledge

Whats steeper

75.5/32mm
75/25mm

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4/15/2014 5:06 PM
Edited Date/Time: 4/15/2014 5:08 PM

Headtube angle and fork offset are not interchangeable. 75/25 would be more stable at higher speeds, but twitchier at lower speeds. Less offset = more trail, so more speed stability. But it would also feel twitchier at lower speeds. If you want something twitchy for things like nose manuals, 75/25 would probably be the best option mainly because it has a slightly shorter wheelbase.

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4/15/2014 5:18 PM

They're actually the same haha. There is an understanding that 1/2 a degree is 7mm & a degree is 14mm. There's Head Tube Slackers in Flatland that adjust the Head Tube Angle. So, You have 75/25mm & 75.5/32mm they should technically feel EXTREMELY similar if not the same! There's nothing to say You cannot run 75.5/25mm. I'm running 75.5/27mm atm & it's great! I'm quite the fan of Super Steep Head Tube Angles. My New Rig is 75 & I'm running 26mm Offset Fork, It's an experimental Frame for Me, but If I can get along with certain aspects of the Frame I will be getting a Custom with 75.5, I would even consider 76 actually! As Ohioan said, Steeper Offset Fork's help shorten Your Wheelbase which makes spins easier & generally easier to pop into Nose Manuals. I'd go with option 3 personally 75.5/25mm. It's not for everyone, but I've ran 75.5/13mm to Me at least, it doesn't actually make a vast amount of difference!

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4/15/2014 5:30 PM

Topsey wrote:

They're actually the same haha. There is an understanding that 1/2 a degree is 7mm & a degree is 14mm. There's Head Tube ...more

Yeah, you won't really notice a difference either way. It depends more on the rest of the bike rather than just the headtube angle and fork offset. With a 75.25 degree headtube, I went from 31mm offset to 25mm offset and didn't notice a difference rather than it being slightly easier to get on to the front wheel. I notice more of a change with headtube angle, though. The bars feel a lot closer to you and I did notice quite a bit of a change in steering stability.

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4/15/2014 11:52 PM

According to my workings out, a .5 Degree steeper headtube would make a pair of 330mm (I think that's the standard leg length) forks 2.88mm further back at the dropouts. So there you go.

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4/16/2014 1:31 AM

Im running 75.5 and 25ofset hahah.

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4/16/2014 7:02 AM

Hmm I had been running 75/25 and it was sweet. Changed to 75.5/25 and was going otb regularly then went to 75.5/32 and now I usually only flip when rolling out going too fast.

Maybe its just in my head, but 75/25 felt so smooth and good and fun bombing hills and so buttery/comfortable at high speed Idk why I got rid of that frame!

Thanks for the input my dudes

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4/16/2014 12:03 PM

To make it simple-
Both will feel feel almost exactly the same for nose tricks.
75.5 will make your stem sit forward a bit more than a 75, but probably only 1-2mm or nothing noticeable.
75.5 will make for snappier barspins, x-ups, etc.
75 (in my experience) makes footjam whips slightly easier than 75.5, I would imagine this applies to regular tailwhips aswell.
75.5 will have less relaxed steering as it requires more control to keep the steerer tube stationary in the steeper headtube.

I personally run 75.5/25 and its PERFECT haha.

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