New Continental 5000s tires - the CLINCHER (not TL) thread

Discuss light weight issues concerning road bikes & parts.
AJS914
Posts: 4119
Joined: Tue Jan 28, 2014 6:52 pm

by AJS914

I think you could have went 25mm on the GP5000.

I have 25mm GP5000TLs on 18mm internal Farsports wheels. I haven't measured them but they seem to be slightly wider than the 25mm rim. BRR claims 26.3mm on a 17mm internal.

Overall I noticed that the 25mm GP5000 is way smaller than the 25mm GP4000. It's sized more like the 23mm GP4000. The other big difference is the height. The GP5000 is quite a bit less tall which would make it easier to remove from a frame.

by Weenie


morrisond
Posts: 973
Joined: Thu Mar 25, 2004 8:34 pm

by morrisond

32mm on 21.5 ID Rim - 34.1mm! Nice and still Round.

iamoutside
Posts: 37
Joined: Sun Aug 05, 2018 7:22 pm

by iamoutside

Reading through this thread it seems that the internal rim width is the determining factor when determining how wide a tyre will be once seated on the rim. Am I correct to assume that or is the external width of a rim the determining factor? I am looking at getting rims that measure 18mm internally and 26 externally and wondering what the true width would be with a 25mm GP5000's.

Hexsense
Posts: 1218
Joined: Wed Dec 30, 2015 12:41 am

by Hexsense

iamoutside wrote:
Mon Mar 09, 2020 12:20 am
Reading through this thread it seems that the internal rim width is the determining factor when determining how wide a tyre will be once seated on the rim. Am I correct to assume that or is the external width of a rim the determining factor? I am looking at getting rims that measure 18mm internally and 26 externally and wondering what the true width would be with a 25mm GP5000's.
Internal width determine how wide each tire will become once pumped.
External width determine how wide a tire can be before it start to effect aerodynamic of the rim in a bad way...

So with 26mm external width, you want the tire to measure UNDER 26mm (under 24.74mm, if possible). This only apply if you want best aero performance.
That's be 23c GP5000 territory. 25c GP5000 at 18mm internal width can become wider than 26mm.

User avatar
pdlpsher1
Posts: 2658
Joined: Thu Jul 19, 2012 6:09 pm
Location: CO

by pdlpsher1

23 and 25 GP5k are poor choices. You'll get more benefits out of the 28s and enjoy the plush ride more. When you are comfortable you can push more watts, negating any aero penalties the 28s may have.

Sent from my KFMAWI using Tapatalk


Jugi
Posts: 678
Joined: Sun Jun 24, 2018 8:10 am

by Jugi


pdlpsher1 wrote:23 and 25 GP5k are poor choices. You'll get more benefits out of the 28s and enjoy the plush ride more. When you are comfortable you can push more watts, negating any aero penalties the 28s may have.
It depends. My "sweet spot" for tire width is around 24mm. Anything wider than nominal 25mm feels too spongy under sprinting out of the saddle. It seems I ride on better than average roads, as I don't see any need for increased comfort.

However, switching from 23 to 25mm as my TT bike's rear tire definetly made me faster. With a 23mm at the TT bike's seating position, any bigger road imperfections felt like the bike tried to kick my nuts. 25mm tire enables me to just push over those.

rides4beer
Posts: 342
Joined: Wed Nov 28, 2018 5:27 am
Location: SC

by rides4beer

Jugi wrote:
Mon Mar 09, 2020 11:57 am
pdlpsher1 wrote:23 and 25 GP5k are poor choices. You'll get more benefits out of the 28s and enjoy the plush ride more. When you are comfortable you can push more watts, negating any aero penalties the 28s may have.
It depends. My "sweet spot" for tire width is around 24mm. Anything wider than nominal 25mm feels too spongy under sprinting out of the saddle. It seems I ride on better than average roads, as I don't see any need for increased comfort.

However, switching from 23 to 25mm as my TT bike's rear tire definetly made me faster. With a 23mm at the TT bike's seating position, any bigger road imperfections felt like the bike tried to kick my nuts. 25mm tire enables me to just push over those.
Yup, everyone will be different. I went with 25mm GP5Ks for my new wheels, forgetting how much of a difference 28mm makes for me on our crappy roads (I'm 86kg), so I'll give up the aero watts for comfort watts and go back to 28's. :thumbup:

tleo
Posts: 30
Joined: Sun Feb 16, 2020 5:08 pm

by tleo

Has anybody mounted the 28's on a wheel with an ID of ~22mm? My 28 GP 4000s II measure almost 32mm exactly on these wheels. I've heard the 5000's are closer to their stated size but how much closer? I've kind of come to like the 4000's on the crappy roads around here.

Thanks.

Reno
Posts: 37
Joined: Fri Oct 25, 2019 7:00 am

by Reno

tleo wrote:
Tue Mar 31, 2020 2:01 am
Has anybody mounted the 28's on a wheel with an ID of ~22mm? My 28 GP 4000s II measure almost 32mm exactly on these wheels. I've heard the 5000's are closer to their stated size but how much closer? I've kind of come to like the 4000's on the crappy roads around here.

Thanks.
I mounted GP5000 28mm on a wheel with 21.5.mm ID. I have a picture of that in the Allez Sprint topic and don't know how to find the post from my profile - I think they came up with approx. 31mm.

EDIT: This page of the Allez Sprint topic:
viewtopic.php?f=3&t=133529&start=1395

tleo
Posts: 30
Joined: Sun Feb 16, 2020 5:08 pm

by tleo

Reno wrote:
Tue Mar 31, 2020 11:00 am
I mounted GP5000 28mm on a wheel with 21.5.mm ID. I have a picture of that in the Allez Sprint topic and don't know how to find the post from my profile - I think they came up with approx. 31mm.
Perfect. Thanks.

tabl10s
Posts: 654
Joined: Wed Aug 23, 2017 5:40 am

by tabl10s

Deleted.
2015 Pinarello F8: 13.13lbs/5.915kg(w/Roval 64's).
2016 Rca: 11.07lbs/5.048kg.
2018 Rca.
2018 S-Works SL6 Ultralight: 12.03lbs.

User avatar
pdlpsher1
Posts: 2658
Joined: Thu Jul 19, 2012 6:09 pm
Location: CO

by pdlpsher1

28mm on 21mm ID rim = 30mm wide. 32mm on 21mm ID rim = 33.5mm wide. Hope this helps.

tleo
Posts: 30
Joined: Sun Feb 16, 2020 5:08 pm

by tleo

pdlpsher1 wrote:
Wed Apr 01, 2020 6:03 am
28mm on 21mm ID rim = 30mm wide. 32mm on 21mm ID rim = 33.5mm wide. Hope this helps.
Thanks!

JMeinholdt
Posts: 151
Joined: Wed Feb 26, 2020 10:31 pm
Location: Topeka, KS

by JMeinholdt

I know this is about the non-TL GP5k, but I'm sure sizing is similar. My 25c on 19mm internal rims measure just shy of 27mm (26.96mm).
Wilier Cento10AIR Rim Brake - Ultegra Di2
BMC GF02 - Ultegra R8000 - Commuter/Trainer

YouTube content (JM Cycling Videos): https://www.youtube.com/channel/UCTGn14 ... _N-wHlViQ/

Strava link: https://www.strava.com/athletes/jmeinholdt

morrisond
Posts: 973
Joined: Thu Mar 25, 2004 8:34 pm

by morrisond

morrisond wrote:
Mon Feb 17, 2020 8:51 pm
32mm on 21.5 ID Rim - 34.1mm! Nice and still Round.
Just some quick feedback on these. Last year I had the same tires on 17mm ID wheels (Shamal Disc) running about 85-90 psi - to where they weren't too squishy for my weight and handled well (I am a clydesadale well over 100kg).

Now on the 21.5mm id Wheels (i9 AR25) I'm down to 60/65psi with no squishiness and absolutely amazing ride.

I am totally sold on wider ID wheels. I just wish Campy (my favourite wheels/hubs) would make something wider than 19mm ID.

32mm Tires are amazing!

by Weenie


Post Reply