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  1. #1
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    Benefits of Taller Bias-Ply Slicks

    After hitting the track the other day and talking to a few people I started thinking about the benefits of a taller tire. Traditionally people have stuck w/ a 25.5-26" DR on the n54 platforms and it has worked decently well. I had a couple ideas though that lead me to believe a taller tire might work out good and I wanted to see what you guys thought.

    1) A 28" taller tire on my MT would allow me to finish the 1/4 at 7010rpm
    -allows me to stay in 3rd and not have a loss by shifting to 4th
    -elongates 1st/2nd gears so that the shifts don't come as fast

    2) A shift to 4th would put me at 5280 instead of 5798 w/ my current DR's
    -puts me at a better spot in my power band

    My search lead me to find that Hoosier has a bias ply true slick that would fit my needs. It's listed as 28x10x17 but it has a sidewall width of 11.3" and a tread width of 9.5". Minimum wheel width is 8" too. The fact that it is a bias ply tire means that it will grow in diameter at higher speeds and should reach 29" w/ no problems. That would put me at 6769rpm in 3rd or 5098 in 4th when trapping 120mph. They will also pay off once I put the RB's on by allowing me to stay much lower in the the rpm range in 4th instead of pushing me to redline or forcing me to shift to 5th with my current DR's. I should be able to cut a very nice 60' with these things considering they are true slicks, have more sidewall and will flex a lot more because of the bias ply make-up. They'll also be lighter than my current tires and easier on my drivetrain. Here's a link to the tire: http://www.summitracing.com/parts/HOO-18157/

    This is the only 17" true slick that I have found and, as far as I know, everybody else is using a DR or mach-slick w/ grooves.
    What are your thoughts?
    07 e92 335i Best run: 11.83@ 120.04 w/ 1.84 60' & 2127 DA

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    Problem is that 4th gear is where you want to be on the RB's. maybe different on MT, but im sure any upgraded TT guy will attest 4th is where it pulls the strongest

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    well with the RB's the gear change to 4th becomes a necessity since the higher trap speed in the equation equates to a higher ending rpm. Trapping 125 means a 5310rpm finish in 4th and trapping 130 means a 5523rpm finish. That's still in the solid power band of RB's, correct?
    07 e92 335i Best run: 11.83@ 120.04 w/ 1.84 60' & 2127 DA

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    of course. all im saying is I want to ge to 4th ASAP. being MT, youll have to see, My 2nd and 3rd gear are too quick, you may benefit from having a longer 3rd..

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    MT also has a 17 inch bias-ply.

    Nobody has used slicks on these cars. Shhhh.... don't tell them.

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    Taller slicks also launch harder off the line. You will have a more profound mushroom effect and the contact patch is larger.
    Some people live long, meaningful lives.

    Other people eat shit and die.

    I'm not racist, I hate everybody equally; especially fat people.


    Click here to enlarge

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    Click here to enlarge Originally Posted by DBFIU Click here to enlarge
    Taller slicks also launch harder off the line. You will have a more profound mushroom effect and the contact patch is larger.
    Yep, yep. And they wrinkle easier...

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    Click here to enlarge Originally Posted by LostMarine Click here to enlarge
    of course. all im saying is I want to ge to 4th ASAP. being MT, youll have to see, My 2nd and 3rd gear are too quick, you may benefit from having a longer 3rd..
    My 1st and 2nd gear go by in nothing flat and are a nearly impossible to shift on time. I always end up shifting at like 6800rpm. 3rd gear doesn't go by very quick and 4th seems to slow me down between the delay from the shift, the drop in boost and the taller gearing. The taller tire would keep me in each gear even longer thus giving me more time to shift at the appropriate time and eliminating the downfalls of the shift to 4th all together(for now). Things are different in the AT because of the lower gearing you have in the rear and in the tranny.
    07 e92 335i Best run: 11.83@ 120.04 w/ 1.84 60' & 2127 DA

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    MT also has a 17 inch bias-ply.

    Nobody has used slicks on these cars. Shhhh.... don't tell them.
    The MT bias ply was the mach-slick that I was referring that has grooves actually
    07 e92 335i Best run: 11.83@ 120.04 w/ 1.84 60' & 2127 DA

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    Click here to enlarge Originally Posted by DBFIU Click here to enlarge
    Taller slicks also launch harder off the line. You will have a more profound mushroom effect and the contact patch is larger.
    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Yep, yep. And they wrinkle easier...
    Both valid points. My only concern is the talk about mixing bias ply rears w/ radial fronts. I know plenty people do it but there have also been accidents claimed to be because of it.
    07 e92 335i Best run: 11.83@ 120.04 w/ 1.84 60' & 2127 DA

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    Click here to enlarge Originally Posted by Trevor008 Click here to enlarge
    The MT bias ply was the mach-slick that I was referring that has grooves actually
    Sorry, didn't see where you mentioned the MT.

    Either way, these are really your two choices for bias-ply in 17's.

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    Click here to enlarge Originally Posted by Trevor008 Click here to enlarge
    Both valid points. My only concern is the talk about mixing bias ply rears w/ radial fronts. I know plenty people do it but there have also been accidents claimed to be because of it.
    Don't play games or risk it, just do it right with bias-ply all the way around.

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    That's a problem though as the only bias ply Hoosier 17's are the ones i listed and some 22" diameter and 2.5" wide skinnies. I guess I'll take another look at the MT's
    07 e92 335i Best run: 11.83@ 120.04 w/ 1.84 60' & 2127 DA

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    Same thing with the MT....... only a 2.5" wide 17" and no 16" options. You guys know of something I don't?

    I'm going to look into custom wheels and see what the cost would be. Might end up scrapping the whole idea if the cost is too high.
    07 e92 335i Best run: 11.83@ 120.04 w/ 1.84 60' & 2127 DA

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    Click here to enlarge Originally Posted by Trevor008 Click here to enlarge
    Same thing with the MT....... only a 2.5" wide 17" and no 16" options. You guys know of something I don't?

    I'm going to look into custom wheels and see what the cost would be. Might end up scrapping the whole idea if the cost is too high.
    Sorry, you mean 2.5 inch tall?

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    No I mean 22x2.5x17 skinnies for the front since I am being told it is necessary to run bias ply's all the way around
    07 e92 335i Best run: 11.83@ 120.04 w/ 1.84 60' & 2127 DA

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    Click here to enlarge Originally Posted by Trevor008 Click here to enlarge
    No I mean 22x2.5x17 skinnies for the front since I am being told it is necessary to run bias ply's all the way around
    Yep, that is the skinny you would need to run.

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    Yeah that's what I meant. It seems as though I would need to get custom wheels made and buy the bias ply's so we're talking about $2k-$3k to drop a few tenths hopefully instead of the $500 or so I was thinking. Pretty sure I'm just going to try out a taller DR to test my theory on stretching the gears instead
    07 e92 335i Best run: 11.83@ 120.04 w/ 1.84 60' & 2127 DA

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    Click here to enlarge Originally Posted by Trevor008 Click here to enlarge
    Yeah that's what I meant. It seems as though I would need to get custom wheels made and buy the bias ply's so we're talking about $2k-$3k to drop a few tenths hopefully instead of the $500 or so I was thinking. Pretty sure I'm just going to try out a taller DR to test my theory on stretching the gears instead
    I went through this same predicament and decided to finally just go bias-ply with custom wheels all around. No more messing around with drag radials.

  20. #20
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    Waiting for an email back from Bogart on pricing for skinnies and for the rear. If it's reasonable I may go ahead with this soon and sell my my dr's k1's. I figure I'm going to need full slicks in order to take advantage of the RB power anyways so I will eventually do this even if it's not this season.

    Did you go with 16's or 17's Sticky? Who'd you get your wheels from?
    07 e92 335i Best run: 11.83@ 120.04 w/ 1.84 60' & 2127 DA

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    Click here to enlarge Originally Posted by Trevor008 Click here to enlarge
    Did you go with 16's or 17's Sticky? Who'd you get your wheels from?
    Have not ordered yet but will be going with custom 17's from CCW.

  22. #22
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    Got an email and a couple phone calls yesterday from Dan at Bogart in reponse to my email asking for info and pricing. After speaking to him for a few minutes about options he gave me a pall park figure of around $1600 but needed some measurements before he could give me a specific quote. I just sent him that info so I should hear back from him shortly. He will be giving me pricing on 17's as well as 16's if they will fit w/ either no modification or a little grinding on the calipers. Tires and tubes are going to run me somewhere around $800 either way I go.
    07 e92 335i Best run: 11.83@ 120.04 w/ 1.84 60' & 2127 DA

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    Click here to enlarge Originally Posted by Trevor008 Click here to enlarge
    Got an email and a couple phone calls yesterday from Dan at Bogart in reponse to my email asking for info and pricing. After speaking to him for a few minutes about options he gave me a pall park figure of around $1600 but needed some measurements before he could give me a specific quote. I just sent him that info so I should hear back from him shortly. He will be giving me pricing on 17's as well as 16's if they will fit w/ either no modification or a little grinding on the calipers. Tires and tubes are going to run me somewhere around $800 either way I go.
    good to know. goin all out i see Click here to enlarge

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    Bogarts are great wheels. Weld Racing makes those redonkulous gold anodized skinnies...baller status...


    Its been a while since i drilled holes in bogarts and put inner tubes in them. I used to do it at my former wheel shop, a lot of SBC guys and Mustang guys had their slicks and skinnies done by us. LM when are you gonna buy a set?

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    lol, never. the K1's are just fine for me and this car. besides, im savin up the the overhaul you need to do on the car Click here to enlarge

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