50 or 55 profile rear tyre? - Suzuki GSXS1000 Forum
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post #1 of 23 Old 01-07-2019, 08:39 PM Thread Starter
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50 or 55 profile rear tyre?

50 or 55 profile rear tyre?
55 raises ride height 9.5mm (reducing head angle by 0.3 degrees) & increases gearing by 3%.
What else does it affect?

Done 15k miles now, started with 50 profile stock, then tried Roadtec 01's at 55 profile and now need to replace the Road 5's also at 55 profile. Now I know the bike I wonder if it is worth trying the OEM size.

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post #2 of 23 Old 01-07-2019, 09:01 PM
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Originally Posted by Simon W View Post
50 or 55 profile rear tyre?
55 raises ride height 9.5mm (reducing head angle by 0.3 degrees) & increases gearing by 3%.
What else does it affect?

Done 15k miles now, started with 50 profile stock, then tried Roadtec 01's at 55 profile and now need to replace the Road 5's also at 55 profile. Now I know the bike I wonder if it is worth trying the OEM size.
Theoretically it helps turn in as 55s generally are a pointier type

However this is all theoretical as manufacturers actually pay scant regard to the sized printed on the side of the tyre.

If you look up the tyre spec sheets you will see they may be very little difference between the height of a 50 an 55 from some companies, just as the width can be completely difference between different manufacturers.

So you really need to compare spec sheets rather than just quoted sizes
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post #3 of 23 Old 01-08-2019, 06:40 AM
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Really liked the Roadtec 01's, The latest Road 5s have been brilliant too. Tempted to try the Pirelli Angel GT next though.
I just put a 190/55 Angel GT on my bike, pleased so far.
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post #4 of 23 Old 01-08-2019, 05:21 PM Thread Starter
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Thanks Dekker, this will be my 4th pair of tyres on the GSXS, all except the OE have impressed me, tempted to revert to the 50 series again just for a sanity check.
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post #5 of 23 Old 01-08-2019, 07:54 PM
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I went from stock to road 5s front and back with the 55 profile. I'm not really sure how much it is with it just being a better tire, as I didn't really like the OEM, but I feel like it is a bit more crisp with turn in, and a lot more confidence inspiring.

I'm not sure I'll even bother going back to a 50 to find out, I've been very happy with the 55 so far, so personally I'll just stick with what's close to it, spec sheet wise and go from there.

I am curious though, if someone has ran the same tire 50 and 55 and felt a difference? I can't see it being much, as I think the general quality of the tire makes the most difference. (Screw the OEMs lol)
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post #6 of 23 Old 01-08-2019, 09:20 PM
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Well I can attest to the R5 50 being a lot quicker than stock, but I haven't tried the 55 so I can't compare the difference for R5 50 to 55. Maybe I'll try 55 next tire swap, but hopefully that won't be for a while.
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post #7 of 23 Old 01-09-2019, 03:38 AM
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Most Road/Sport tyres are built as a compromise of 50 and 55 Profile tyres, it may be say a Michelin 50 profile offers near similar profile to a Pirelli 55 Profile. Each profile is manufacturer dependant and the numbers 50 or 55 are only a base line point and not an exact figure which is rigidly adhered to. The more sport orientated the tyre the more it is designed to turn corners and offer quick turn in or change in direction, the more touring biased tyres are built to offer stability rather than quick turn in.

In conclusion it's not necessarily what profile you have but whose tyre and what it's built for.[/QUOTE]

Pretty much what I said earlier but netter put and more comphrehensive.

More and more large tyres are coming in 60 profile for the road now too, what used to be used to.be the preserve of track slick is now available in various tyres from Pirelli if.not others
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post #8 of 23 Old 01-09-2019, 04:35 AM
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Originally Posted by PhuketPaul View Post

Pretty much what I said earlier but netter put and more comphrehensive.

More and more large tyres are coming in 60 profile for the road now too, what used to be used to.be the preserve of track slick is now available in various tyres from Pirelli if.not others
Sorry Paul, yes it is, I hadn't read the full thread.

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post #9 of 23 Old 01-09-2019, 01:07 PM
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post #10 of 23 Old 01-09-2019, 06:09 PM
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I had Pirelli Rosso III, 190/55 profile rear which i thought, always tipped and quick to turn with gluey grip.
I personal feel the OEM 50 rear gave more stability but ... slow
I have now changed to Pirelli Diablo Supercorsa SP V3 Hypersport Rear Tire - 200/60ZR17.
I don't ride in the wet and still keep the front OEM
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