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                                                                     EXHIBIT 5.1
 
                                                         PENSKE MOTORSPORTS LOGO
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ROBERT H. KURNICK, JR.
Senior Vice President and
General Counsel
 
August 12, 1996
 
Penske Motorsports, Inc.
13400 Outer Drive West
Detroit MI 48239
 
               Re: PENSKE MOTORSPORTS, INC.
 
Ladies and Gentlemen:
 
     I have represented PENSKE MOTORSPORTS, INC., a Delaware corporation (the
"Company") in connection with the preparation and filing with the Securities and
Exchange Commission (the "Commission") of a Registration Statement on Form S-8
(the "Registration Statement"), for registration under the Securities Act of
1933, as amended (the "Securities Act"), of a maximum of 400,000 of the
Company's Common Shares, par value $0.01 per share (the "Common Shares"), issued
or to be issued pursuant to the Penske Motorsports, Inc., 1996 Stock Incentive
Plan (the "Plan").
 
     Based upon my examination of such documents and other matters as I deem
relevant, it is my opinion that the common Shares to be offered by the company
under the Plan pursuant to the Registration Statement have been duly authorized
and, when issued and sold by the Company in accordance with the Plan and the
stock Options exercised thereunder, will be legally issued, fully paid and
nonassessable.
 
     I hereby consent to the filing of this opinion as an exhibit to the
Registration Statement. In giving such consent, I do not admit hereby that I
come within the category of person whose consent is required under Section 7 of
the Securities Act of the Rules and Regulations of the Commission thereunder.
 
                                          Sincerely,
 
                                          Robert H. Kurnick, Jr.
                                          Senior Vice President and General
                                          Counsel
 
RHK:kal
Enclosures
 
PENSKE MOTORSPORTS, INC. 3270 WEST BIG BEAVER / SUITE 130 / TROY, MICHIGAN 48084
                  TELEPHONE: 810-614-1116 / FAX: 810-614-1125