This chart is used by AHRMA motocross tech inspectors as a quick method of determining maximum rear suspension travel. Inspectors may also choose to follow the procedures listed in rule 11.2(a) of the AHRMA Handbook. The chart will be updated from time to time as more information is gathered. For questions or suggestions about additions to the chart, contact one of the national motocross tech chiefs or Motocross Rules & Eligibility Committee members listed here.
- All motorcycles must clear/pass tech inspection. Those with forward-mounted rear shocks will/should be check even closer each time.
- All motorcycles will have no more than 7 inches of front wheel movement and no more than 4 inches rear wheel travel. This is not shaft travel.
- “Travel limiters” are available for $2.00 each at every AHRMA MX event.
MX Tech - Vintage Class shock travel guide
*Note: All measurements include one-third the thickness of the rubber bumper.| Brand & Year | Model 11 | Maximum visible shaft length* | Comments |
|---|---|---|---|
| AJS | |||
| 1969-74 | 250/370/410 | 3½ inches | Standard swingarm (over axle) |
| 2½ | Moved up swingarm | ||
| American Eagle | 125/250/360/405 | 3½ | Stock swingarm |
| Bultaco | |||
| 1967-73 | 3¼ | Stock swingarm | |
| Metisse | Model 11 | 3½ | Stock swingarm |
| 1975 | 250 only | 2½ | Straight up and down |
| Can-Am | MX-1 | 3 | Standard swingarm |
| Cheney | |||
| Early | 3½ | Nickle plated (over axle) | |
| Late | ? | Moved forward (check) | |
| CZ | |||
| 1968-73 | 125/250/360/400 | 3½ | Stock frame & swingarm |
| 1974 | Red frame | 3½ | Stock frame & swingarm |
| 1975 | Falta | 2¾ | Stock frame & swingarm |
| Greeves | All | 3½ | Stock frame & swingarm |
| Hodaka | 125 | 3¼ | |
| Honda | |||
| 1973-74 | CR250 | 3¼ | Stock setup |
| 1974-75 | CR125 | 3¼ | Stock setup |
| 125 | 2¼ | With Redline swingarm (always check) | |
| Husqvarna | |||
| 1968-74 | 3½ | Without Mag swingarm (pre-'74) | |
| 1968-74 | 3 | With Mag swingarm | |
| 1968-74 | 2¾ | With Profab swingarm (straight up & down; always check) | |
| Kawasaki | |||
| 1973 | F11M & F12M | 3½ | All stock frame & swingarm |
| 1974 | KR250 & KX450 | 3½ | All stock frame & swingarm |
| 1974-76 | KX125 | 3½ | |
| 1975-76 | KX250 & KX450 | 2¼ | "Forward mounted" (always check) |
| Maico | |||
| Pre-1974½ | 3½ | Stock frame | |
| 1974½ | 2½ | No holes in frame mount; 1 mount on swingarm (rare) | |
| 1975 | 2¼ | Holes in frame/middle lower mount (always check) | |
| Ossa | |||
| 1967-72 | Stiletto | 3¾ | Over axle |
| 1974 | Phantom 125/250 | 3½ | Allow swingarm stock part |
| Penton/KTM | |||
| 1973-74½ | Check | Middle lower mount (always check) | |
| Rickman | All | 3½ | Over axle |
| Sprite | All | 3½ | Over axle |
| Suzuki | |||
| 1971-74 | TM 125/250/400 | 3½ | Stock setup |
| 1975 | TM 125/250/400 | 2½ | Straight up & down shocks |
| Trackmaster | All | 3-5/8 | Nickle plated |
| Yamaha | |||
| 1972-74 | MX250/360 & SC500 | 3½ | Stock setup |
| DT/RT2 MXes | 3½ | Stock setup | |
| YZ250/360 | 3½ | Stock setup |
