Bike Size Chart: Find Your Bike Size by Height and Inseam
Enter your height and inseam to get a bike size recommendation, then compare Trek, Giant, and Specialized sizing before you buy.
Model geometry is a reference check; sizing comes from the available size chart rows.
Enter your measurements to see your recommended size, backup size, confidence, and why it fits.
Priority size guides
Start here for the most popular bike sizing tools and charts.
What size bike do I need?
Start with height, inseam, bike type, standover, and reach before buying.
Gravel size guide
What size gravel bike do I need? Compare height, inseam, standover, and brand labels.
Road bike size chart
Check road frame labels by height, inseam, stack, reach, and riding fit.
Bike frame size chart
Compare bicycle frame size labels by height, inseam, bike type, and unit.
Find your size in 30 seconds
One measurement flow, brand-specific answers.
Bike Size Finder starts with height and inseam, then checks bike type and brand sizing so you do not rely on a generic chart alone.
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Enter height and inseam
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Choose bike type
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Compare brand sizing
Bike size chart by height
Compare Trek, Giant, and Specialized
Popular model size charts
Check the exact model before choosing a frame.
Trek Domane Size Chart
Trek Domane SL 5 sizing by height and geometry.
Trek Checkpoint Size Chart
Trek Checkpoint SL 5 sizing by height and geometry.
Giant Revolt Size Chart
Giant Revolt Advanced sizing by height and geometry.
Giant Defy Size Chart
Giant Defy Advanced sizing by height and geometry.
Specialized Diverge Size Chart
Specialized Diverge sizing by height and geometry.
Specialized Roubaix Size Chart
Specialized Roubaix sizing by height and geometry.
How recommendation works
Official charts first. Geometry when available.
We start with published size ranges, then use inseam, standover, stack, and reach to explain close calls.
FAQ
Short answers for riders choosing a size before purchase.
What size bike do I need for my height?
Start with your height range, then confirm with inseam. If you are between two sizes, bike type and riding style usually decide whether to size up or down.
Is bike size based on height or inseam?
Both matter. Height gives the first size range, while inseam helps check standover clearance and whether the frame will feel too tall or too small.
Should I size up or down if I am between sizes?
For road bikes, size down for a sportier fit and size up for a more relaxed fit if reach is comfortable. For gravel and mountain bikes, many riders prefer the smaller size for easier handling.
Are Trek and Giant bike sizes the same?
Not always. The same rider height can map to different labels across Trek, Giant, and Specialized, especially when one brand uses S/M/L and another uses centimeter sizing.