Cartire on rear - Harley Davidson Street Forum - Street 500 and 750
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post #1 of 10 Old 05-15-2019, 06:23 PM Thread Starter
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Cartire on rear

I am not going to get into if it is a good idea or not on a two wheel bike. Thus is for a Street 750 with sidecar. Something that has been done with sidecars a lot long. The Street presented an issue. The 15 inch tire. Many claimed that unlike the 16 inch wheels a Car tire would not work. Using a Wheel Solo750 had from a wrecked bike I got the spoons out. Been a while sense I had to mount a car tire by hand.
Using a used tire lubed wheel up and it went on. At first it looked like a failure. Could not get the bead to sat right. Newer motorcycle wheel have a ridge inside about 1/2 back from the lip. It is meant to keep the tubeless tires on the wheel when they go flat. The bead would not pop over it in a section about 4 inches long on each side. I do quit easy. So after dismounting it , lubing the beard and trying again 2 more times I got it. took 110 pounds of air to pop it in place. Then let air out to 35 pounds all good. Now need to figure out the size tire to use.
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post #2 of 10 Old 05-16-2019, 01:09 AM
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You were lucky that the car tyre finally "popped" on Smitty. What is the actual tyre size on the 750 rim? I did not pick it up on the attachment.

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post #3 of 10 Old 05-16-2019, 05:37 AM Thread Starter
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You were lucky that the car tyre finally "popped" on Smitty. What is the actual tire size on the 750 rim? I did not pick it up on the attachment.

The 2015 Street has a 15 inch wheel The tire size is 140/75R15. I am looking at using a 165/65R15. What makes it hard to get seated is the bead inside the wheel that helps prevent the tire from coming off the wheel if it goers flat.
It would be just under an inch wider and about 1/2 larger cir..


This compares the two the red in the 165/65R15
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post #4 of 10 Old 05-18-2019, 07:14 AM Thread Starter
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Made up my mind the rear car tire will be a 155/60R150. reason are simple not much difference in width slightly smaller height that will in effect reduce gearing a bit. The 165 would raise gearing and could be an issue with the sidecar. Looked it it from all sides and the 155 wins.


20 mph (32.19 km/h)19.19 mph (30.88 km/h)25 mph (40.23 km/h)23.98 mph (38.6 km/h)30 mph (48.28 km/h)28.78 mph (46.32 km/h)35 mph (56.33 km/h)33.58 mph (54.04 km/h)40 mph (64.37 km/h)38.38 mph (61.76 km/h)45 mph (72.42 km/h)43.17 mph (69.48 km/h)50 mph (80.47 km/h)47.97 mph (77.2 km/h)55 mph (88.51 km/h)52.77 mph (84.92 km/h)60 mph (96.56 km/h)57.56 mph (92.64 km/h)65 mph (104.61 km/h)62.36 mph (100.36 km/h)
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post #5 of 10 Old 05-21-2019, 12:59 AM
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I agree Smitty that going for the slightly smaller diameter to assist in the gearing with the sidecar is the way forward.

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post #6 of 10 Old 05-21-2019, 05:08 PM Thread Starter
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I agree Smitty that going for the slightly smaller diameter to assist in the gearing with the sidecar is the way forward.

I purchased the new tire today. But a ride coming up so it will have to wait a bit going on. Looks like width is not going to be an issue either.
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post #7 of 10 Old 06-05-2019, 02:14 PM Thread Starter
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Installed the 155/60R15 on the 750 Street about an hour ago. Took it for a ride. It works gets a bit more traction can pull the front end up with out spinning the tire as much. But the final answer is yes it , yes it works.
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post #8 of 10 Old 06-05-2019, 02:52 PM Thread Starter
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Here is how it looks.


[url=https://flic.kr/p/2g9pfPo]


[url=https://flic.kr/p/2g9pgNN]
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post #9 of 10 Old 06-07-2019, 02:59 AM
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That actually looks "badass" with the new tread pattern. The slightly lower gearing will be an advantage with the sidecar attached.

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post #10 of 10 Old 06-07-2019, 05:40 AM Thread Starter
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Originally Posted by Propnut View Post
That actually looks "badass" with the new tread pattern. The slightly lower gearing will be an advantage with the sidecar attached.

I rode the bike awhile with out the sidecar. The tire worked well. Playing a bit the found the front end will come up easier rather than spin the tire as it did with stock tire. You can feel the bike is a bit quicker with the smaller tire.
Put sidecar back on. it works great. After a few miles to get the feel of it I started to play. Flew the car just over a mile at low and high speeds it had no issues. Down the road I still want to try a 165/60R15.
The 155/60r15 was a safe bet.
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