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Believe it or not...I don't know (remember) what size my HH100 is. How would I find out? I think it's 23.5... BUT...I want to measure it against some other frames that are in the house. I am trying to get a singlespeed that fits similar to my HH... One has a taller headtube, another longer seattube. It seems that one frame is smaller than the HH, while the other is longer. Hmmmmm....which one to build up. Anyway, still want to know how to measure the TT on the HH, given that it is sloped. Thanks. Alan.
 

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IPAs make me wanna puke.
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Alan said:
Believe it or not...I don't know (remember) what size my HH100 is. How would I find out? I think it's 23.5... BUT...I want to measure it against some other frames that are in the house. I am trying to get a singlespeed that fits similar to my HH... One has a taller headtube, another longer seattube. It seems that one frame is smaller than the HH, while the other is longer. Hmmmmm....which one to build up. Anyway, still want to know how to measure the TT on the HH, given that it is sloped. Thanks. Alan.
It's tough to do without an extra set of hands, but HH sizes refer to their effective top tube length. This is the horizontal length from the top center of the head tube to the center line of the seat tube. Basically, the bike needs to be set up just like Charles at HH set it up (sag, fork length, etc.) to get an exact measurement, but you can get close using a level and a string.
 

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Do It Yourself
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From hammerheadbikes.com:

GEOMETRY

ToptubeHead
Angle
Seat
Angle
ChainstaySeatube (c-c)Seatube
(c-t)
HeadtubeBB HeightWheelbaseStandover
22707416.6513.7516.253.751341.527.5
22.5717316.651416.541341.527.5
23717316.651517.54134228.5
23.5717316.6515.5184.251342.529
24.25717316.6517.51951343.2531

I would suggest measuring the seat tube and looking at the chart for the top tube size.
 
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