The PI-1 Alloy 45×45 headset has an aluminum top cap, upper bearing cover, lower race and upper and lower cups. All-aluminum construction results in a lightweight headset. Each headset is fitted with super-smooth rolling, precision, 45×45 angular-contact sealed bearings.
Because this versatile headset has 45×45 angular-contact bearings, you can use the included cups and install it in standard frames. Or, leave the cup in the box, and use it as an Integrated headset
Finding the right size bicycle is important for a comfortable and enjoyable ride. There are various frame sizes available that are designed to fit riders of different heights, as well as different wheel sizes and frame styles. To choose the best fit, you can look at the sizing and geometry chart provided by the manufacturer. This will show you the seat tube length and top tube length, which can affect the stand-over clearance and comfort of the bike. You want to aim for a comfortable position that isn't too cramped or stretched out. If you have any questions about finding the right size bike for you, our team of experts is always happy to help.
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Kids Bikes:
Child height (Inch)
Child height (cm)
Wheel size
2’9”-3’1″
85-90 cm cm
10/12 inches
3’1”-3’3″
90-100 cm
12/14 inches
3’3”-3’7″
100-110 cm
14/16 inches
3'7"-3'8"
110-115 cm
16/18 inches
3’8”-4’0″
115-120 cm
18/20 inches
4'0”-4’5″
120-135 cm
20/24 inches
4'5"-4'9"
135-145 cm
24/26 inches
5 inches+
145 cm +
26 inches
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Mountain Bikes:
Adult height (Inch)
Frame Size (Inches)
Frame size
4'10-5'2"
13 - 14"
X-Small
5'2-5'6"
15 - 16"
Small
5'6-5'10"
17 - 18"
Medium
5'10-6'1"
19 - 20"
Large
6'1-6'4"
21 - 22"
X-Large
6'4-6'6"
22 - 24"
XX-Large
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Road Bikes:
Adult height (Inch)
Frame Size (Inches)
Frame size
4'10-5'2"
47-48 cm
XX-Small
5'2-5'6"
49 - 50 cm
X-Small
5'3-5'6"
51 - 53 cm
Small
5'6-5'9"
54 - 55 cm
Medium
5'9-6'0"
56 - 58 cm
Large
6'0-6'3"
58 - 60 cm
X-Large
6'3-6'6"
61 - 63 cm
XX-Large
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