Last Conti GP4000SII
 

So i just put on my last GP4000SII, since they have been discontinued, should I just get the newer GP5000 or something else?

I've ridden the GP4K for the past 10 years or so and know them so I can predict their handling.

I'm open to suggestions.

https://cimg5.ibsrv.net/gimg/bikefor...b90073f376.jpg
Make me an offer....

I have a pile of one-Ironman 4KSIIs in a drawer.

The 5K is superior in all respects except for slight aero and wear rate. It handles better is lower RR. You may want to size up depending on how much space was left from the 4K.

The cool kids, for a minute, were using a front 4KSII and rear 5K because of the aero vs RR advantages of each.

Not to detract from the OP's question, but:
I am still using the GP4000SII 's as well.
25mm on my Roubaix and 28mm on my Sirrus.
I've been very happy with them.
Knowing that the 4000's run "a little big" i.e. 25mm measure closer to 28mm and 28mm run closer to 30mm when mounted...
I've heard that the 5000's are closer to their indicated size so .... when I make the switch to the 5000's should I "size up" i.e. Run 28's on the Roubaix and 32's on the Sirrus?
(lots of frame/fork clearance with current 4000 set-up)

I would size up in that case. They're down by almost, but not quite, a full size. If a 23mm 4K is a squeeze, a 25mm 5K might not quite make it. If you say you have "lots" of clearance, sizing up will be much closer to the same size, though it might be ever-so-slightly larger.

^ Awesome! Thanks so much!

If you liked 4000s you will be perfectly happy with 5000s. The sizing difference is real. My 28mm 5000s are no larger than the 25mm 4000s I used previously. They measure 28mm. The 5000s may be a little more flat resistant but I can't tell much difference otherwise. That said, I'm not too particular about tires, rode Gatorskins for years w/o complaint.:lol:

Thanks guys.. I purchased a pair of 5Ks. Surprised that they are also cheaper.

My 4Ks were 25mm and a 28 rubbed in the front. I'll see how the %ks fit and maybe buy a 28mm to test fit.

Yeah, my GP5K in 25 mm measures maybe 7/8" wide mounted on a 17 mm internal width wheel. Thankfully the roads are smooth in my area.

The 4k's are definitely bigger than the 5k's. Great tires either way. The 5000's are crazy expensive at $50 a pop. That's my only complaint. A freaking motorcycle tire is just a few $ more. What's up with that?

Ah Continental motorcycle tires are more. You must mean Shinko tires.

I switched from 4000 to 5000 tires a few years ago. With 19.5mm inside width carbon rims the 4000s were wider by about 1.5mm with the 25mm tires on my old Madone 5.0. Just got a Domane SL6 a few weeks ago on a warranty upgrade. The 25mm inside width rims are huge. I’ve tried a 25mm and 23mm GP5000 on. Thinking of a 28mm in the rear. Here are a few measurements in case you get wider rim. All tires stretched for at least a day.

Paradigm Comp 25 wheel Rim. 31mm outside. 25 mm inside
Conti 25mm w/tube 90 psi. 30.0mm x 26 tall
Conti 23mm w/tube 100psi. 28.67mm x 22 tall
Bontrager R2 32mm w/tube 65 psi 34.98mm x 32.69 tall
Conti 28mm 80 psi 31.1 mm w/tube 80 psi ?

oh not going 23mm with this rim even though 28mm is the minimum width.
25mm for close to the aero 105 and 28mm for general rougher road.

I have the P Zero Race TLR in 28's on my Domane with the Aeolus Pro 3V and its 25mm internal and they measure roughly 29.8, can't find my micrometer...so .... Rides like a dream for me at 70 PSI.

The 4000s were never particularly cheap. And $50/each is/was a good price for either if you're buying at your LBS. of course, that's why many of us look for sales on PBK.

They were routinely low 30s...

I am such a hoarder of consumables, I still have FOUR GP4000s tires in the closet. At this rate next tire might be GP6000!

GP4ks were excellent tires. And tires have a huge impact on how a bike rides. There are a ton of great tires now though. Starting to feel like a golden age.

Maybe in your neck of the woods. I never saw GP4000s priced that way in a retail shop. Only in the online gray-market sites like PBK and Wiggle. Those sites have GP5000s for similar. For example, I just saw a two pack of GP5000 clinchers on PBK for $78, so there's no difference as far as I can tell.

Hope this is not a repeat from my side but anyway, I picked up 5-6 4000s to stock up. The 5000 (per the rep) is slightly lighter, slightly faster, and has a touch less puncture resistance. It is also sized accurately, unlike the 4000s. So the 25 will run very close to 25 in the 5000, while the 4000s run 27 or even 27.5. I measured them really close to 27 and 27.5 on two diff rims.

$50 for a top-of-the-line tire doesn't not seem all that expensive to me in the scheme of cycling expenses.
I just spent twice as much for a new chain ring.

I found this too. The GP4000's always sized up larger, a 23mm was more like a 25mm tyre. The new GP5000's seem to be more "correct" in their sizing.

Interestingly I also found the GP5000's harder to fit! Not difficult, but I could fit GP4000's with ease whereas the GP5000's seem to take a bit more wrestling to get on and off. Not a deal breaker.

Unfortunately I can vouch for them being a tad less puncture resistant. It may have just been an unlucky couple of rides, but I had 4 flats in the same amount of rides back to back. I love the GPs though so I'm definetly sticking with them, just had to add some tire liners (I know I know) for a bit more peace of mind.

At that point I would just run a somewhat more robust tire, like the Michelin Power Protection Plus I use. The liner will kill the properties of the GP5K that you like in the first place.

The "I know I know" bit above was the preemptive response to this exact point. But I get your point 👍

I know… but it I’ve tried both ways. In case you haven’t, it’s worth a shot. I think you’ll like it better. Free advice you may freely ignore. :beer:

Totally! And completely appreciate it. I've brought that up here before and have been absolutely thrashed into the ground. It's just so hard to give up a tire you've come accustomed to. Even if it is because it has a tire liner 😂. Serious note though, it may be time to try something else, so I'll give that a shot :beer: