自行车车架几何对比工具
对比 stack、reach、轴距、操控信号和轮胎间隙，用于把现有车架和目标碳纤维车架方向做采购前评估。
它可以作为车架几何对比工具、stack/reach 计算器和碳纤维车架 RFQ 采购草稿使用。
Import numbers from a brand geometry table
Estimate handlebar position after stem and spacer changes
This is a practical estimate for comparing setups, not a professional bike fit. If Bike B is close in frame geometry but off at the handlebar, stem length, stem angle and spacer height may bring the position closer.
What changed between these frames?
Bike B trends more upright.
Longer wheelbase and lower steering angle usually calm the bike down.
More clearance supports wider tires and mixed-surface use.
Frame position, scaled from stack and reach
HTCX-02
The target tire clearance points toward a CX / cyclocross discussion rather than a narrow road-only platform.
Send the buyer report with target use, quantity, testing target and budget range. HT Carbon can review whether an existing platform or OEM/ODM project direction may fit.
Send buyer reportSide-by-side geometry difference
| Measurement | Current road race frame | Target all-road frame | Difference | What it may mean |
|---|---|---|---|---|
| Reach | 390 mm | 385 mm | -5 mm | Horizontal distance from bottom bracket to top of head tube. |
| Stack | 545 mm | 565 mm | +20 mm | Vertical distance from bottom bracket to top of head tube. |
| Top tube | 545 mm | 540 mm | -5 mm | Effective top tube length from seat tube to head tube. |
| Head tube | 140 mm | 160 mm | +20 mm | Head tube length. Affects front-end height and fit range. |
| Head angle | 73 deg | 72 deg | -1 deg | Steeper is usually quicker; slacker is usually more stable. |
| Seat angle | 74 deg | 73.5 deg | -0.5 deg | Affects saddle position and pedaling posture. |
| Wheelbase | 985 mm | 1,010 mm | +25 mm | Longer wheelbase usually feels more stable at speed. |
| Chainstay | 410 mm | 425 mm | +15 mm | Shorter rear center can feel more responsive. |
| BB drop | 70 mm | 72 mm | +2 mm | Bottom bracket drop. More drop can feel planted on road bikes. |
| Fork rake | 45 mm | 47 mm | +2 mm | Fork offset. Used with head angle to understand steering feel. |
| Max tire | 30 mm | 42 mm | +12 mm | Published maximum tire clearance or target tire width. |
Use this bike geometry comparison tool to prepare better frame discussions.
The geometry chart for a specific HT Carbon model should be confirmed before formal quotation. These platform notes help you decide which product direction to discuss first after your bike frame comparison.
Bike Geometry Comparison Tool: how to compare frames before sourcing
A bike geometry comparison tool is the safest starting point when frame size labels are not standardized. A 54 cm road frame from one brand can feel longer, lower, taller or more relaxed than a 54 cm frame from another brand, so compare the numbers before you compare the size name.
Use stack and reach as the first frame comparison
Stack and reach define the position of the top of the head tube relative to the bottom bracket. Reach is the horizontal value and stack is the vertical value. Together they show whether the front end of a frame is long and low, balanced, or taller and more upright. This is why a stack and reach calculator is more useful than choosing by S, M, L or nominal centimeter size alone.
Use the bike geometry calculator to read handling signals
Wheelbase, head tube angle and chainstay length shape the handling character. A longer wheelbase and slacker head angle usually feel calmer at speed. A shorter wheelbase and steeper front end usually feel quicker, especially on road race bikes. For gravel, CX and MTB projects, those geometry changes can matter more than the model name.
Turn bike frame comparison into a carbon frameset RFQ
Tire clearance quickly separates road, all-road, cyclocross, gravel and MTB frame requirements. For a carbon frameset sourcing project, send the target tire size together with geometry, cockpit setup, expected quantity and testing target. That turns a simple bike frame comparison into a clearer OEM or ODM discussion.
Turn this comparison into a usable carbon frameset inquiry.
Bike geometry comparison tool questions
What is a bike geometry comparison tool?
A bike geometry comparison tool compares frame measurements such as stack, reach, wheelbase, head angle, seat angle, chainstay length and tire clearance so buyers can understand fit and handling differences between two frames.
How do I use a bike geometry comparison tool?
Enter or paste the geometry for Bike A and Bike B, then compare stack, reach, wheelbase, head angle, seat angle and tire clearance. The tool highlights fit changes, handling signals and the likely carbon frame sourcing direction.
Is this also a bike geometry calculator?
Yes. This bike geometry calculator compares two frames, estimates stack and reach ratio, checks handlebar position after stem and spacer changes, and exports the result for a bike frame comparison or RFQ discussion.
Why are stack and reach important when comparing bike frames?
Stack and reach are useful because they describe the front-end position of a frame relative to the bottom bracket. They make it easier to compare frames across brands because size labels such as 54 cm or Medium are not standardized.
Can this tool replace a professional bike fit?
No. This tool helps compare frame geometry and prepare sourcing discussions. A professional bike fit is still recommended for rider-specific fit decisions, especially for racing, injury history or unusual body proportions.
How can a bike brand use this tool for OEM or ODM sourcing?
A bike brand can compare its current frame or target market benchmark with a new target geometry, then send the stack, reach, wheelbase, tire clearance and project requirements to a carbon frameset supplier for feasibility review.