OEM Bridgestone S21 VS S21

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sfisher543
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OEM Bridgestone S21 VS S21

Post by sfisher543 » Tue May 19, 2020 10:56 pm


I have always been skeptical when it comes to OEM tires on a new car and had never thought that the same thing could happen to new bikes. Tire manufacturers will create a tire for a specific car or motorcycle and stamp it with "TPC Spec" on the sidewall, GM is a good example for this. This has me thinking as I look down on my half worn Bridgestone S21 with only 1100 miles on the clock which were mostly easy break in miles.

I ordered a new rear tire, another Bridgestone S21 as they have been excellent tires for me in the past (11,000-12,000 miles on my GSXR-1000). My below attachments show several minor differences. OEM tire is still mounted on the wheel, both are clearly marked as rear tires.

1. On the OEM tire after "S21R" there is a F... I have no idea if this means anything but the new tire I ordered off Bike Bandit does not have this. Both sides of each tire are the same except for the DOT number being stamped on just one side.

2. The DOT number on the OEM tire is "ENCX DDJ 0119" and the new tire is "ENCX DJD 1919" I know the last 4 digits are the week and year they were manufactured and the first digits have to do with where they were manufactured. Being that the 3 middle letters are not the same tells me that they possibly were produced in different factories.

3. Above the DOT number there is a series of letters and numbers that appear to display the model of the tire. OEM is "S21RGZ K1650" new tire is "S21RZ K1503". Why is the new one missing the G and why are the last 4 digits different?

I don't think I would be wrong to come to the conclusion that Bridgestone created a S21 branded tire to Kawasaki's specs, whether that be a different compound to cut cost or other minor differences. However due to the secret code that tire manufactures have created and the thousands of Tire Rack ads that pop up when you google anything tire research related, I have found it extremely difficult to turn up any information to prove this theory. I hope this generates some good thoughts and ideas that could help lead to answers.
Attachments
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unknownbiker
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Re: OEM Bridgestone S21 VS S21

Post by unknownbiker » Wed May 20, 2020 1:18 pm


F for Front & R for Rear?
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neb50
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Re: OEM Bridgestone S21 VS S21

Post by neb50 » Wed May 20, 2020 2:37 pm


From Revzilla for the S21 tires. I have ~3000 miles on my stock tires and they are about done and will switch them out with S22's from the Cyclegear deal a couple months ago with the Bridgestone rebate.

120/70ZR17 E OE fitment for Honda CBR1000RR 2017
120/70ZR17 G OE fitment for Suzuki GSX-S750 2017
120/70ZR17 J OE fitment for Yamaha R6 2017
120/70ZR17 F OE fitment for Kawasaki Ninja H2 SX
120/70ZR17 M OE fitment for the Honda CB1000R
180/55ZR17 G OE fitment for Suzuki GSX-S750 2017
180/55ZR17 J OE fitment for Yamaha R6 2017
190/50ZR17 E OE fitment for Honda CBR1000RR 2017
190/55ZR17 F OE fitment for Kawasaki Ninja H2 SX
190/55ZR17 M OE fitment for the Honda CB1000R
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duaneb
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Re: OEM Bridgestone S21 VS S21

Post by duaneb » Tue May 26, 2020 3:15 pm


My factory S21s are now completely worn out after 3700kms, mostly just highway touring miles. Full set of Pilot Road 5 GT going on next.
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Jasonvii
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Re: OEM Bridgestone S21 VS S21

Post by Jasonvii » Tue May 26, 2020 8:11 pm


Had my baby a few months and it came with 1800 miles, S21 rear was done at 3k so changed to S22 which has now done 1k miles and is excellent definitely feels better when it’s leaning 👍🏻
Just waiting for my S22 front to arrive as it’s now done after 4.3k 😃
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