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Hunter Gatherer Frame Geometry

A few words regarding frame geometry from Endpoint—It's important to take into account how a seat tube angle can change the effective top tube measurement. You can have two frames where with the exception of the seat angle, both frames are exactly the same, and the effective top tube will measure out differently. As the seat tube angle becomes more steep, the top tube measurement gets shorter even though the bars do not actually get closer in relationship to the bottom bracket of the frame. 


Think about it this way—The bottom bracket and top of the head tube are the two fixed points on the frame that actually determine fit. The saddle moves up, down, back and forth to adjust for seat tube angle, and to get the rider properly placed over the pedals. 

We chose to use a 73 degree seat tube angle across all frame sizes. What this means is when you are looking at geometry to select a size, you should be considering stack and reach and ignoring effective top tube length. Many bikes currently have steeper seat tube angles which will make the top tube feel longer than it actually is. For every 1/2 degree the seat tube increases, the effective top tube shortens by about 1/2 a centimeter.

Take a look at the geometry for the medium Hunter Gatherer. If we were to have steepened the seat tube angle to the 74 degrees of a medium Endpoint Coffee Grinder, the effective top tube would have measured out to 54cm rather than 55cm even though the bike isn't actually getting any shorter. So look at effective top tube if you must but don't linger on it too long. If you have any questions about sizing don't hesitate to ask. We're happy to geek out on fit and geometry to make sure you get the right size frame. 

Geometry

    SM MD LG XL XXL
A REACH 365 375 385 395 405
B STACK 550 575 605 630 645
C TOPTUBE HORIZONTAL 533 551 570 588 602
D HEADTUBE 114 140 171 197 213
E SEATTUBE CENTER TO CENTER 450 500 520 540 560
F FORK AXLE TO CROWN 403 403 403 403 403
G FORK RAKE 70 70 70 70 70
H CHAINSTAY LENGTH 435 435 435 435 435
I HEAD ANGLE 73 73 73 73 73
J SEAT ANGLE 73 73 73 73 73
K BOTTOM BRACKET DROP 65 65 65 65 65
L TRAIL (650b X 47mm tire) 37 37 37 37 37

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