# NHTSA Preliminary Evaluation PE04051
> **WHEEL SEPARATIONS** · Opened 2004-07-22 · Closed 2004-11-23
## Investigation
- **Action number:** PE04051
- **Type:** Preliminary Evaluation
- **Open date:** 2004-07-22
- **Close date:** 2004-11-23
- **Manufacturer:** Airstream, Inc.
- **Affected makes:** AIRSTREAM; GENERAL COACH; KEYSTONE; KOMFORT
- **Affected components:** WHEELS; WHEELS:LUGS/NUTS/BOLTS/STUDS
- **Affected model years:** 2003
- **Affected (make, year) variants:** 14
## Summary

WHEEL SEPARATIONS AT THOR INDUSRIES HAVE PREDOMINANTLY OCCURRED IN VEHICLES MANUFACTURED BY KEYSTONE RV.KEYSTONE RV HAS REPORTED 110 SEPARATIONS OF STEEL WHEELS OF 64,727(0.17%) AND 15 SEPARATIONS OF ALUMINUM WHEELS OF 6,984 PRODUCED (0.21%) IN RECREATIONAL VEHICLESMANUFACTURED SINCE MARCH 2003.OTHER DIVISIONS OF THOR INDUSTRIES, DUTCHMAN (4), THOR CALIFORNIA (0), THOR AMERICA (2), KOMFORT CORP (2), AND AIRSTREAM (14) HAVE REPORTED FEWER WHEEL SEPARATIONS OVER A BROADER TIME PERIOD (SINCE 2000) THAN KEYSTONE RV. SINCE A SIGNIFICANT MAJORITY (92%) OF THE WHEEL SEPARATIONS THAT HAVE OCCURRED IN THOR INDUSTRIES VEHICLES HAVE OCCURRED IN KEYSTONE RV VEHICLES, ODI WILL FOCUS INVESTIGATION ACTIVITY ON THESE PRODUCTS AND OPEN AN ENGINEERING ANALYSIS (EA) AT KEYSTONE RV TO INVESTIGATE THE CAUSE(S) FOR WHEEL SEPARATIONS.

## Source
- [NHTSA ODI investigation page](https://www-odi.nhtsa.dot.gov/owners/SearchResults?searchType=ID&targetCategory=I&searchCriteria.nhtsa_ids=PE04051)
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