For correct frame sizing, up to four measurements are needed:
Note for bikes equipped with optional Tilt Steering:
Since this option adds 2 inches to the total stem height, a smaller size stem should be
used so that the handlebars do not end up too high. If you order a bike from the factory
with the tilt steering option, we will automatically install the appropriate shorter stem. But
for later upgrades or repair work, be sure to obtain the appropriate size stem. For
example, a Large/XL Thunderbolt with tilt steering should have a medium stem. An even
shorter small stem is available, and should be used for Small/Medium Tbolts or Phantoms with
Tilt Steering.
The Thunderbolt is available in the following frame sizes:
| Frame Size | Rider Height | Ex-Seam | Rider Weight Limit |
| Small/Medium | 5' - 5' 10" | 37 - 42" | 250 lbs. |
| Large/XL | 5' 8" - 6' 6" | 42 - 48" | 250 lbs. |
On the Phantom, two seat sizes are available for each frame size. This gives a better fit, resulting in more power, especially when climbing hills.
1. Use the Height to determine the Seat Size.
Note: Riders having a relatively short torso, who are also toward the lower end of the
height range for a particular seat size, should order the next smaller seat size.
2. Use the EXseam dimension to determine the Frame Size.
Seat Size |
Rider Height |
Frame Size |
Ex-Seam (in.) |
Rider Weight Limit |
| Small | 4'9" to 5'3" | Small/Medium | 35 - 41" | 220 lbs. |
| Medium | 5'2" to 5'9" | |||
| Large | 5'7" to 6'2" | Large/XL | 41 - 49" | 250* lbs. |
| X-Large | 6'0" to 6'8" |
* 300 lbs. with Heavy Duty Seat/Frame
These models are available in three or four frame, seat, and stem sizes. The seat and stem interchange with different size frames for a
custom fit.
Note: Only the P-38 is available in a small size. The small P-38 seat is not interchangeable, and can only be used with the small P-38
frame.
1. Use the Height to determine the Seat Size.
2. Use the EXseam dimension to determine the Frame Size.
3. Use the Inseam dimension to determine the Stem Size.
Note: If V handlebars are used instead of the drop bars, the next larger stem size than the one determined by the chart below should
be used.
Frame, Seat and Stem Size |
Rider Height |
Ex-Seam (in.) | Inseam (in.) | Rider Weight Limit |
| Small | 4'9" to 5'3" | 35 - 38* | 23 - 27 | 160 lbs. |
| Medium | 5'2" to 5'8" | 37.5 - 41 | 26 - 30 | 200 lbs. |
| Large | 5'7" to 6'1" | 41 - 44.5 | 29 - 33 | 220 lbs. |
| X-Large | 6'0" to 6'6" | 44 - 47.5 | 32 - 36 | 250 lbs. |
* Note: For the small P-38, in order to prevent crank interference, a 16x1 tire/rim OR 155 mm cranks are used for riders with an
ex-seam less than 36.5".
An Extended bottom bracket is available for slim riders with a short torso and long legs.
This results in a lighter bike, since the next smaller frame size can be used. This option is not recommended for strong or heavy
riders, as frame flex increases with the smaller sizes. Follow the
directions above to determine the correct seat, frame, and stem size when the Extended bottom bracket is used.
| Frame and Seat Size | Height | Ex-seam | Inseam | Stem Size |
| Small | 4'9"- 5'3" | 37 - 41" | 25 - 30" | Medium |
| Medium | 5' 2" - 5' 8" | 40 - 44 | 28 - 33 | Large |
| Large | 5' 7" - 6' 1" | 43 - 47.5 | 31 - 36 | X-Large |
| X-Large | 6' 0" - 6' 8" | 46 - 50.5 | 34 - 39 | XXL |
The following forks are available for the P-38. When forks are ordered separately,
please indicate the size, type, and brake mount.
| Size | Type | Brake Mount | Use |
| 16" | Rigid or Suspension | V Brake or Caliper | Small Frame, 16x1 or 1-3/8 tire |
| 16 x 1-3/8 | Rigid or Suspension | V Brake | Medium Frame, 16 x 1-3/8 tire |
| 20 x 1 | Rigid or Suspension | Caliper (dual pivot) |
Med/Large/XL Frame, 20 x 1 tire |
| 20" | Rigid or Suspension | V Brake | Large/XL Frame, 20 x 1.25 tire |
If you have any questions about all of this, give us a call!
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Copyright 2001 Lightning Cycle Dynamics |