Questions concerning the angles, tube lengths, and other measurements of the bike frame.
The most common angles used are angle of the head tube and the seat tube, measured from the horizontal.
Questions tagged [geometry]
99 questions
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4 answers
What effect does head tube angle have on a bicycle?
My girlfriend and I are looking at a new bike for her. The one we're looking at has a 70 degree head tube angle while her current bike has a 70.5 degree head tube angle. Unfortunately, none of the local shops has one in stock for her to try out. So…
jimchristie
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2 answers
What effect does seat tube angle have?
I know that head tube angle affect steering, but does seat tube angle affect maneuvering somehow? As long as I compare a few models, they are between 72 and 74 degrees, and greater the frame smaller seat tube angle. So I guess difference by a few…
Maz
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5
votes
2 answers
Comparing 'upright-ness' across several endurance road bikes
I'm comparing the following endurance road bikes, all in 58cm or L:
BMC Roadmachine
Cannondale Synapse
Trek Domane
Look 765 Optimum
Specialized Roubaix
I'm 6'2" and recently recovered from a herniated disk and hip arthroscopy. Given that, I'm…
Brad Solomon
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4
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1 answer
Fork offset vs angle -- what is the difference in steering
When you read such post as this one https://bikeinsights.com/cyclopedia/trail you will learn how offset and head tube angle affects steering.
But I wonder about those parameters in "reverse" -- given trail (constant) when we change offset and angle…
greenoldman
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3
votes
1 answer
3
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1 answer
Should I prioritise reach over stack (in choosing a new bike)?
I'm in progress of choosing a new bike (or more specifically trading my MTB for a CX), and have asked for a CX with stack and reach numbers fitting my current road bike, an BMC GF01 'endurance' bike (I ride it with the stem low with only a conical…
softbear
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vote
1 answer
Geometry measurement, from where to where
I'm looking at http://www.specialized.com/ca/en/bikes/road/tarmac/tarmac-comp#geometry and would like to know what "Seat-Tube Angle" means. For say the 56, I would assume that angle is like this
Where the horizontal black in parallel to the earth,…
Bike Geometry
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Why the vertical difference between the right-most point of TT and the left-most (union with ST) is not part of a geometry chart?
One of the things I often look to determine whether a bike fits a specific purpose is that distance mentioned in the title, that is, if you draw a line from the stem to the seat tube, and then you draw a vertical line from the union of both ST and…
user39537
0
votes
1 answer
Desirable maximum steering angle
Zero means going straight, 90+ degrees is probably impossible.
So what is the maximum steering angle needed to ride safely?
user3127882
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