Bigger rear tire? - Harley Davidson Street Forum - Street 500 and 750
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post #1 of 14 Old 02-07-2019, 09:17 PM Thread Starter
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Bigger rear tire?

Hello every one, I hope this hasn't already been asked, I couldn't find it by searching. Will a 180 tire fit on the street rod rear wheel? I want a little more meat back there, but I wasn't sure how wide i could go.
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post #2 of 14 Old 06-16-2019, 09:13 PM
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i dont see why not, our rims can handle 180 at the back. Tons of space with current 160. I cant wait mine till they need a replacement
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post #3 of 14 Old 06-18-2019, 10:01 PM
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Ad78.... how is the 160 compare to 150. no doubt looks great from the back. any difference in cornering as oppose to 150. have already paid deposit to change 150/80-15, if 160 cornering performance same same, will get 160.
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post #4 of 14 Old 06-19-2019, 03:40 PM
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Forget guess work. Use this page put in you stock tire size put in the size you wish to try. It will tell you the difference in all aspects and provide a visual reference if you click on compare. It works with any size tires.


Example : Stock 140/75R15 tire compared to a 150/80R15. Pictures shows black your stock size red shows the tire you wish to compare. Other information on the pages gives you all the information you need.
That size will have some effects on your bike. Important to know what each number in the tire size means.



https://www.tacomaworld.com/tirecalc...5r15-150-80r15
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Last edited by smitty901; 06-19-2019 at 03:49 PM.
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post #5 of 14 Old 06-20-2019, 08:45 PM
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Thanks Smitty, awared of that web, its more on performance that am interested. anyway, will be going for 150/80 as 160/80 radial speed is lesser or something like that.
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post #6 of 14 Old 06-20-2019, 09:14 PM
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Originally Posted by wke002 View Post
Thanks Smitty, awared of that web, its more on performance that am interested. anyway, will be going for 150/80 as 160/80 radial speed is lesser or something like that.

The 150 is the width of the tire the 80 means that your tire has an aspect ratio of 60%. In other words, your tire's sidewall height (from the edge of the rim to the tire's tread) is 60% of the width.

and of course the 15 is the whole in the middle.
The width is either inches or metric so that one is easy to predict the aspect takes a bit more work to fit out what will and will not fit.
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post #7 of 14 Old 06-22-2019, 06:23 AM
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Just got back installing both tires, rear Exedra max(150/80-15) and front H50 = Bridgestone. The shop told me not to speed first, well it was raining on way back home.

On the topic of tire pressure, can’t find Bridgestone pressure chart. My conclusion on google search is whatever tires indicate max cold pressure, in this case 41psi, an ideal would be to substract 10-15% for the ideal tire pressure. Correct me if am wrong.
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post #8 of 14 Old 06-23-2019, 02:51 PM
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Why are you subtracting Air pressure from the cold recommendation ? The only pressure marked on most tires is the Max you can go . If you have a recommend cold pressure start with that and do your chalk tests.
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post #9 of 14 Old 06-24-2019, 10:08 PM
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first time hearing chalk test and read a a few sites which is quite interesting. have yet to try it out but from the "feeling". a typical motorcycle tire is not flat like car tires, its bulging out in the center (sorry, dunno what u call it). based on what i understand from chalk test, the "ideal" is to have the width surface fully touch ground when riding, end to end width, but from the "feeling", would cornering than be more dangerous as already both side width is in contact with ground, when cornering, this will come in contact with the outer width?

If i look at my new tires, with cornering and all riding, 50% is been used and both 25% per side has not touch the ground. maybe would need to lower the recommended pressure to have at least balance 5-10% side width not use?

Thanks for sharing in advance as this weekend, going uphill trip with my wife, hence need to know as much about tire pressure as possible.
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post #10 of 14 Old 06-25-2019, 03:25 AM
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Hope someone could help if indeed no problem to ride as am going uphill and downhill these weekend.

From Harley Manual, it states :

GVWR = 400 kgs
GAWR Front = 114 kgs (252lb) **
GAWR Rear = 286 kgs (630lb) **
** THE TOTAL WEIGHT OF ACCESSORIES, CARGO, RIDING GEAR, PASSENGER AND RIDER CANNOT EXCEED THIS WEIGHT.

both me and my wife combine weight with jacket, no luggage at 122kgs(268lbs),

The tires wall indicate
1) Rear - Max.Load 335kgs
2) Front - Max.Load 200kgs

appreciate share if we could ride together based on above data.

to be honest, am confused as Harley manual did not state referring to front or rear or combine GAWR
the tires itself if I calculate, Harley weight 225kgs + human combine 122kgs = 347 kgs which exceed the rear max load of 335kgs.
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