recently manufactured '28mm' Continental GP 4Season tyres

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Foghat
Posts: 27
Joined: Sat Nov 03, 2012 12:03 pm

by Foghat

Has anyone purchased '28mm' Continental GP 4Season tyres recently? If so, how wide are they (and on what rim width and at what pressure)?

I've had many of these tyres labelled as '28mm' over the years, but all of them have struggled to get to 26.0mm wide, even after stretching from plenty of use, and even on a 17mm internal width rim.

However, I'm wondering if Continental has changed anything, perhaps in the last year or so. This is because I saw in the wild not long ago a pair of GP 4Season tyres, labelled as '28mm' on rims I know to be 17mm internal width, and they seemed (looked and felt) enormous compared with all of my '28s' - not as large as 32mm GP 4Seasons, which are pretty close to or slightly over 32mm (so they weren't mis-labelled 32s), but definitely a lot larger than 26mm. I didn't have measuring calipers with me, but I've handled enough 26-26.5mm GP 4Seasons for years on a variety of rim widths to know exactly how wide they feel by hand, and how wide they look.

I wasn't able to interrogate the owner as to the provenance of their tyres - hence the query about recent purchases that some may have made.

Of course, Continental has always been irritatingly untrustworthy in the labelling of its tyre sizes. The '28mm' GP4000S II famously measures well over 29mm on a 15mm internal width Open Pro....but it seems, going by early reports, that its replacement, the new GP5000, is actually substantially narrower than the equivalent GP4000S II.

I'm still wanting GP 4Seasons that are wider than 26mm, but without having to make the huge jump to the 32mm version - so has Continental actually started making its '28mm' GP 4Seasons at the right size, or has this one-off sighting falsely got my hopes up?
Freight-train groove-ride: 4'02" to 14'40" LOUD, bass right up and eyes closed!

AJS914
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Joined: Tue Jan 28, 2014 6:52 pm

by AJS914

BRR says that the 25mm version measures 27mm:

https://www.bicyclerollingresistance.co ... eason-2015

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tomycs
Posts: 90
Joined: Tue Mar 15, 2016 1:06 pm

by tomycs

Installed 28mm Conti GP 4Season December 2017 on 17mm internal width winter wheels. Definetely measured 28mm+ (maybe 28.3 mm new)

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Foghat
Posts: 27
Joined: Sat Nov 03, 2012 12:03 pm

by Foghat

tomycs wrote:
Sun Dec 23, 2018 10:07 pm
Installed 28mm Conti GP 4Season December 2017 on 17mm internal width winter wheels. Definetely measured 28mm+ (maybe 28.3 mm new)
Thanks - other reports are also confirming the same, so it looks like Continental has indeed changed the sizing of its '28mm' 4Seasons. I shall be ordeing some soon.
Freight-train groove-ride: 4'02" to 14'40" LOUD, bass right up and eyes closed!

tomycs
Posts: 90
Joined: Tue Mar 15, 2016 1:06 pm

by tomycs

I've also tried the same tyres on wider rims. I use my Venn 507s as winter wheels (long story) and tge slightly used (2k km) 28mm GP 4Seasons on 21mm internal width (at room temperature) measured 30.8mm.

audioblazer
Posts: 80
Joined: Tue Jul 25, 2017 2:09 pm

by audioblazer

Just fitted a 25mm GP4000S2 on a rim with internal width of about 17-18mm & external width of abt 27mm. It’s ballooned to easily 28mm wide which is fine because u can adjust the brake caliper. However the height of the tire is easily 2mm taller compared to a Panaracer gravel king 26mm . Touches the top of my SR12 brake caliper . Replaced it with a Panaracer evo A 25mm which is distinctively shallower

bikebreak
Posts: 27
Joined: Thu May 19, 2016 10:44 am

by bikebreak

When I had 4 seasons they were a bit narrow, I haven't used them in a few years

the '28mm' GP4000S is a whopping 31mm on my wide rims

I don't think the new GP5000 are any lighter than 4000, I think they changed them back to actual size instead

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