Tire info

From: SMTP%"lawrence@aclcb.purdue.edu" 22-MAR-1995 13:32:04.56
To: MEL1523
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Subj: Hawk Tires

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Date: Wed, 22 Mar 1995 14:33:29 +0000
To: MEL1523@ACS.TAMU.EDU
From: lawrence@aclcb.purdue.edu (Jim Lawrence)
Subject: Hawk Tires

>Date: Mon, 23 Jan 95 13:42:16
>From:
>Subject: Hawk Tires
>To: mx%"lawrence@aclcb.purdue.edu"
>Cc:
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>From: MX%"Doug_Wiebe@NeXT.COM" 2-SEP-1994 18:40:30.33
>To: MX%"HawkGT@dsea.com"
>CC:
>Subj: Re: NewTireQuestions (fwd)
>
>> oh my, so all 150/70's are NOT alike? wow. Guess I don't fully
>> understand the tire size thing.
>> So what are the benefits of a 160/60 17 tire as opposed to the 150/70?.
>> It's late in the day and I'm kind of foggy...help!
>
>I'm no tire expert, but here's how I understand things. All 150/70's are
>alike in that they are (approximately) 150mm wide and their height is
>(approximately) 70% of their width, i.e., 105mm. However, for a given tire
>size the optimal rim size can vary between manufacturers or even between
>different tire models from the same maker. The optimal rim size is a design
>parameter of a given tire; the tire assumes its intended cross-sectional
>profile when mounted on such a rim. If a tire is mounted on a smaller than
>optimal rim the tire is "pinched"; this makes the tire profile rounder, which
>tends to make the contact patch smaller, make the tire "fall into" turns, and
>makes it harder to use the tread clear out to the edge. If a tire is mounted
>on a larger than optimal rim the tire is, uh, "anti-pinched", the tire beads
>are spread out too far and the tire profile is flattened; this makes the tire
>harder to turn and reduces maximum lean. Typically a given tire can be safely
>but suboptimally mounted on rims 0.5" larger and 0.5" smaller than the
>optimal size.
>
>The stock Hawk (piece'o'shit) tires are 150/70's designed for (let's hope!)
>the Hawk's 4.5" rim. However, many aftermarket 150/70's are designed for 4"
>rims, so in those cases using that stock size is actually suboptimal. On the
>other hand, many 160/60's are designed for 4.5" rims so those tires work well
>on a Hawk. On some bikes, running fatter than stock tires can cause the tire
>to rub against the swingarm or something; for example, the Dunlop 591 170/60
>on the Hawk rear rubs against the plastic chainfence. However, 160/60's work
>fine on the Hawk.
>
>A couple of fine points. A 160/60 has a height of 160*0.6 = 96mm, so it is
>slightly shorter than stock. This lowers your bike's ride height in the rear
>slightly which affects the bike's handling slightly (by slightly increasing
>the bike's trail). Ride height in the rear can be adjusted via the stock
>shock's preload adjustment but since that has other suspension effects one
>might instead choose to raise the fork tubes slightly in the clamps (to lower
>the front end) if you want to regain the stock trail. I've left my Hawk's
>forks in the stock position.
>
>The other point is that typically the fatter 160/60's will lean slightly
>slower than a 150/70. This isn't a problem in practice, what is more
>important is that the profiles of the front and rear tires complement each
>other and this is usually true when you use "matched sets" of front and rear
>tires, at least when the tires are the proper sizes for the rims.
>
>- Doug
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>From: Doug Wiebe
>Date: Fri, 2 Sep 94 15:22:42 -0700
>To: HawkGT@dsea.com
>Subject: Re: NewTireQuestions (fwd)
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>From: lawrence@aclcb.purdue.edu
>To: LAWRENCE@ACLCB.PURDUE.EDU
>Message-ID: <0098AE4F.95A83D20.79@aclcb.purdue.edu>
>Subject: Hawk Tires
>
>