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355 Best titanium bolts for challenge wheels

Discussion in '348/355' started by sbenus, May 20, 2025.

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  1. sbenus

    sbenus Formula Junior
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    #1 sbenus, May 20, 2025
    I’ve looked through various older threads regarding the magnesium speedline challenge wheels on roadgoing F355s. From what I’ve been able to gather, the OEM Ferrari accessory titanium bolts used on newer models are 52mm and apparently a bit too short to use on the challenge wheels. It seems that these wheels require 55mm bolts in order to be mounted to the road cars.

    I saw mentioned that Hill engineering makes these 55mm bolts in titanium for this application but didn’t see them on their website. Can someone point me in the right direction? Any other recommended suppliers? Looking for the best solution currently available. Thanks in advance
     
  2. Jpwulf

    Jpwulf Karting

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    #2 Jpwulf, May 20, 2025
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  3. Jpwulf

    Jpwulf Karting

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    #3 Jpwulf, May 20, 2025
    This is where to order them. Just make sure the size is 55mm
     
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  4. sbenus

    sbenus Formula Junior
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    #4 sbenus, May 20, 2025
    Thanks, although it appears those are the standard bolts, not titanium
     
  5. Jpwulf

    Jpwulf Karting

    Sep 26, 2022
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    #5 Jpwulf, May 21, 2025
    https://www.hillengineering.co.uk/v225-55-20ti-t80x10

    this should be what you’re looking for? I guess the ones I got for my challenge wheels aren’t the titanium ones
     
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  6. ShineKen

    ShineKen F1 World Champ
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    #6 ShineKen, May 21, 2025
    Now would be the time to decide if you want spacers or not. If you do, you’ll need longer than 55mm bolts. 67mm would be ideal. I recommend Hill 11mm spacers if you do.
     
  7. Mitch Alsup

    Mitch Alsup F1 Veteran

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    #7 Mitch Alsup, May 21, 2025
    You save 10× (or more) the rotational inertia by using rotors with aluminum hubs instead of Ti bolts with standard rotors.
     
  8. ShineKen

    ShineKen F1 World Champ
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    #8 ShineKen, May 21, 2025
    Or do both :).


    Problem is there is only a plug n play option for the fronts, not the rears, therefore a visual mismatch.
     

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