Tires

GENERAL

Tires should be inspected for punctures, cuts, breaks and wear at least weekly if in daily use, or before trips if used occasionally.

Whenever a tire is replaced, the tube should also be replaced. Inner tubes should be patched only as an emergency measure. Replace the damaged tube as soon as possible.

Inner tubes must be used with all Harley-Davidson cast and laced wheels. Rim bands must be used on laced wheels.

Some rear tires have arrows molded into the tire sidewalk These tires should be mounted on the rim with the arrow pointing in the direction of forward rotation. The colored dot on the tire sidewall is a balance mark and should be located adiacent to the valv*» stem hole.

Wheel rims are of the drop-center type, having a depression or "well" in center of rim. Rim well, being smaller in circumference than rest of rim, allows one casting bead to fit loosely in it while other bead is being worked over edge of rim.

REMOVING TIRE FROM RIM

1. Remove wheel; lay wheel on its side.

2. Remove valve cap and valve core to free all air from tube.

3. Loosen both beads from rim flanges by stepping on sides of tire or by using a tire tool. Stand or kneel on tire opposite valve to push bead into rim well.

4. Using tire tools (not sharp instruments), start upper bead over edge of rim at valve. Don't use force when starting bead over edge of rim with tire iron, because bead wires may be broken or stretched and tire ruined. Carefully remove tube before attempting to remove second bead.

5. Push lower bead into rim well on one side and insert tire iron on opposite side and pry bead over flange. After a portion of second bead is started over rim edge, tire can be further removed from rim without aid of tire iron.

NOTE

It is not always necessary to completely remove casing from rim. Removing one side allows tube to be removed and reinstalled and also allows inside of casing to be inspected.

MOUNTING TIRE ON RIM

Before installing tube in tire, all dust and dirt, particularly hard particles which might chafe an inflated tube, must be removed. Wipe tube and inside of tire thoroughly with clean, dry cloth. If rim is dirty or rusty, clean with a stifl wire brush. Be sure to examine a used tire carefully for fabric injuries that may damage tube.

Before mounting tire, see that rubber rim strip is in place in rim well, and that rim strip valve hole registers with valve hole in rim.

WARNING — Use correct inner tube for tire size. See "Tire Data" Section 1.

1. Insert tube in tire, placing valve at tire balance mark. Swab thoroughly all around base of tube, between the tube and side walls of tire with tire mounting lubricant. Inflate tube just enough to round it out. With wheel lying flat, place tire on rim and align valve with hole in rim. Mount tire on rim so that arrow on sidewall points in direction of wheel rotation. Balance mark on tire sidewall should be adjacent to the valve stem.

2. Push bottom bead into rim well near valve and hold in well while forcing remaining portion of bead over rim flange with a tire tool.

3. Spread tire and insert valve through hole in rim.

4. Force upper bead over rim flange and into well at point opposite valve. Stand or kneel on this side of tire to hold it in well and pry remaining portion of tire over rim flange. While forcing bead over rim flange, keep as much bead as possible in rim well. Be careful not to damage beads or pinch tube. Inflate tire to recommended pressure and check valve for leak. See tire inflation pressures in "Tire Data," Section 1.

5. After inflating to recommended pressure, completely deflate to smooth out any wrinkles in tube and allow tube to find its place, free from strain or stress. Again inflate to recommended pressure and check valve for leak.

WARNING

Do not inflate over 40 psi to seat the beads. Inflating the tire beyond 40 psi to seat the beads can cause the tire-rim assembly to burst with force sufficient to cause personal Injury. If the beads fail to seat at 40 psi, deflate and relubricate the bead and rim and reinflate to seat the beads but do not exceed 40 psi.

CHECKING TIRE TRUENESS SIDEWAYS (LATERAL RUNOUT)

1. Check runout by turning wheel on axle, measuring amount of sideways displacement from a fixed point near the tire (see figure 2-19).

2. Tire tread runout should be no more than 3/64 in. If tire tread runout is more than 3/64 in., remove tire from rim and check rim bead side runout to see if rim is at fault (see "Truing Wheel").

3. It rim side runout is less than 1/32 in., tire is at fault and should be replaced. If rim side runout is more than 1/32 in., correct by tightening selected spoke nipples as outlined previously, reinstall old tire and recheck tire tread lateral runout.

TIRE TREAD LATERAL RUNOUT

Figure 2-20. Checking Tire Radial Runout

CHECKING TIRE ROUNDNESS (RADIAL RUNOUT)

1. Check runout by turning wheel on axle, measuring tread runout (see figure 2-20).

2. Tire tread runout should be no more than 3/32 in. If tire tread runout is more than 3/32 in., remove tire from rim and check rim bead runout to see if rim is at fault (see "Truing Wheel").

3. If rim bead runout is less than 1/32 in., tire is at fault and should be replaced. If rim bead runout is more than 1/32 in., correct by tightening selected spoke nipples as outlined previously, then reinstall tire and recheck tire tread runout.

WHEEL ALIGNMENT

Side View

Rear

Front

Rear

Front

Rear

Top View

Shift Axle in Rear Fork to Correct Misalignment

Front

Straight edge

Figure 2-21. Wheel Alignment Diagram

1 oz. weight. Part No. 95582-47 3/4 oz. weight, Part No. 95581-47 1/2 oz. weight. Part No. 95578-41 Cast aluminum wheels require the special self-adhesive weights listed below;

Aluminum color 1 oz. weight. Part No. 95588-75 1/2 oz. weight. Part No. 95587-75

Black

1 oz. weight, Part No. 95591-77 1/2 oz. weight, Part No. 95590 77

NOTE

Rims and tires must be true before checking wheel alignment, as outlined in previous paragraphs.

Front and rear wheels should be in perfect alignment. This can be checked on the motorcycle with a straight wooden board or length of string by placing against rear tire side wall as far up toward axles as possible. Straightedge should be parallel to tires (see Figure 2-21). On FL models, the front tire should be offset 3/16 inch to the right of the rear tire. Adjust rear wheel in axle clips as necessary to correct misalignment.

WHEEL BALANCING

Wheel balancing is recommended to improve handling and reduce vibration, especially at high road speeds. Harley-Davidson has made available the following spoke balance weights which press over the spoke nipple.

Self adhesive wheel weights should be applied to the flat surface of the rim. Make sure that area of application is completely clean, dry and free of oil and grease. Remove paper backing from weight and press firmly in place so that arrow on weight points in the direction of wheel rotation. If 1 oz. or more of weight must be added at one location, split the amount so that half is applied to each side of the rim. Wheel should not be used for 48 hours to allow adhesive to cure completely.

In most cases, static balancing using wheel truing stand. Part No. 95500-29A, will produce satisfactory results. However, dynamic balancing, utilizing a wheel spinner, can be used to produce finer tolerances for best high speed handling characteristics. Follow the instructions supplied with the balance machine you are using. The maximum weight permissible to accomplish balance is 3-1/2 oz. total weight applied to the rim. Wheels should be balanced to within 1/2 oz. at 60 mph.

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