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Thread: tire pressures - drag slick

  1. #1
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    Default tire pressures - drag slick

    Any suggestions on what tire pressures to run in a 7" drag slick? I'm looking at either the Mickey Thompson ET Drag Motorcycle (26/7.0 x 17"), or the Shinko Reactor II (same size).

    Bike is a GS1150-based machine, 8" extended swingarm, wheelie bars, hardtail, stock frame (besides the swingarm).

    Looking to fit (and adjust) the wheelie bars; I understand (and it makes sense) that you want to have the tires at track pressures before adjusting them.

    Happy to give more details if they'll help with a recommendation.

  2. #2
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    Bob..... Calling Bob baatfam......

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  3. #3
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    There's folks here who know a lot more about racing a small slick bike than I do, and it has been awhile.
    But:

    Hopefully one of the others can help, but I remember running in the 8-10 psi range. (It's been 12-13 years)
    Mines was a bar bike, so no extended swing arm. Meaning it may need to be adjusted from there.

    It's hard to see in this photo, but you can see how the sidewall wrinkles. That's what you want.

    RT66 Dragbike Series by R John Thieda, on Flickr
    Bob T.

    "That which you manifest is before you." -- Enzo
    "I always prefer to believe the best of everybody, it saves so much trouble." -- Rudyard Kipling
    "...for our existence to hold any value, it must end. To live meaningful lives, we must die and not return." -- Number Six

    '83 GS1100E ~ '01 TRIUMPH TT600 ~ '99 TRIUMPH TROPHY 900 ~ '67 HONDA CUB



  4. #4
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    thank you for the info, that's a starting point!

    wheelie bars vs. no wheelie bars
    --AND--
    extended swingarm vs. stock swingarm

    what's the rule of thumb here for setup? (Assuming the racing club's rules don't have any concrete requirements about what you can and cannot run...)

    I've built a few successful road race bikes but never a drag bike. My uninformed thinking is that in general, "longer is better", which makes me think extended swingarm and wheelie bars would be a good way to go. Am I out to lunch?

  5. #5
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    by the way, @Baatfam, nice photo! Tell me more about the bike, please, if you've got a few minutes ... what engine, frame, etc.?

  6. #6
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    It depends on the total weight of your bike. I am at 7.8 lbs on my Pro Et bike with the Mickey. It weighs about 590lbs with me on it.
    stay away from the Shinko Slicks. No where near as consistent as the Mickey.
    My stable
    84 GSX1100EFG-10.62 @ 125 mph 64'' W/B.
    85 GS1150-9.72@146mph stock W/B.
    88 GSXR1100-dragbike 9.18@139.92mph/5.68@118mph.
    98 Bandit 1200-9.38@146mph/6.02@121mph.
    90 Suzuki GS 1425cc FBG Pro Stock chassis 5.42@124mph
    06 GSXR750 10.44@135mph
    00 Honda elite 80 pit bike

  7. #7
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    Good info, thanks, I'll be sure to weigh it (and me, with gear) once it's built. Thanks for the warning about the Shinkos, too.

  8. #8
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    A safe starting point is 8.0 psi and then go from there as needed.
    Ray.
    85GS1150E 83GS1100ESD 83GS1100SD 83GS1100ED 82GS1000SZ 96GSXR1500Dragbike 96GSXR1400Dragbike 90GSXR1166Dragbike 04SDG110PITBIKE + 8 Quads! "Life is tough! It's even tougher if you're stupid!" John Wayne

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    Thanks, Rapidray!

  10. #10
    Baatfam's Avatar
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    Good! I see stetracer and RapidRay are here, so you are in good hands.
    I've been out of the game too long to give good advice.

    Good luck...And I'll be expected updates.
    Bob T.

    "That which you manifest is before you." -- Enzo
    "I always prefer to believe the best of everybody, it saves so much trouble." -- Rudyard Kipling
    "...for our existence to hold any value, it must end. To live meaningful lives, we must die and not return." -- Number Six

    '83 GS1100E ~ '01 TRIUMPH TT600 ~ '99 TRIUMPH TROPHY 900 ~ '67 HONDA CUB



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