Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Blog NEW Galleries NEW FAQ Contact About Impressum
It is currently Sun Nov 19, 2017 10:12 am

All times are UTC+01:00




Post new topic  Reply to topic  [ 51 posts ]  Go to page Previous 1 2 3 4 Next
Author Message
PostPosted: Mon May 01, 2017 1:29 am 
Offline

Joined: Wed Dec 30, 2015 12:41 am
Posts: 269
deciding between two choices, going on front 21mm internal, 28mm external rim, rear 17mm internal, 28mm external rim.
Vittoria Corsa G+ 25c front + 28c rear, it'll be 240+265 grams.
or
4000sII 23c front + 25c rear due to tire clearance and Conti's are oversized, i wouldn't be able to run 28c.
this will be lighter at 215+225 grams. But also a bit narrower and require a bit higher pressure (as i go down in size) so it won't be as comfortable as Vittoria.

At first i think i'm set going for the first choice but this thread make me rethink.


Top
   
PostPosted: Mon May 01, 2017 3:50 am 
Offline

Joined: Thu Jul 19, 2012 6:09 pm
Posts: 1109
Location: Loveland, CO
Hexsense wrote:
deciding between two choices, going on front 21mm internal, 28mm external rim, rear 17mm internal, 28mm external rim.
Vittoria Corsa G+ 25c front + 28c rear, it'll be 240+265 grams.
or
4000sII 23c front + 25c rear due to tire clearance and Conti's are oversized, i wouldn't be able to run 28c.
this will be lighter at 215+225 grams. But also a bit narrower and require a bit higher pressure (as i go down in size) so it won't be as comfortable as Vittoria.

At first i think i'm set going for the first choice but this thread make me rethink.


I've noticed the weight diff. between Vittoria and Conti tires. One would think Vittoria would be lighter but the scale tells a diff. story. Is cotton heavier than polyester? The Conti 'looks' heavy but it's rather light given the amount (thickness) of thread it has. Anyhow I didn't buy the Conti due to the low weight but it's a pleasant and welcomed attribute. I run 23mm front and 25mm rear and run 90psi on both. Love it.


Top
   
Posted: Mon May 01, 2017 3:50 am 


Top
   
 
PostPosted: Mon May 01, 2017 8:36 am 
Offline
User avatar

Joined: Wed Aug 18, 2004 6:06 pm
Posts: 252
Location: Lower Saxony - Germany
25mm tire on 21c rim will be fine. 28mm tire on 17c rim won't. The tire will sit like a light bulb on the rim and you will not only destroy aerodynamics but also need to use a high tire pressure or it will feel squishy. And with the high pressure you will have vibrations again, which you won't have with the front wheel.

Maybe you can replace the rear rim?

https://www.lightbicycle.com/Road-bicyc ... lable.html

https://www.lightbicycle.com/Road-bicyc ... lable.html

Your current 17c 28mm wide rim sounds like Zipp - they are made for 23mm tires...

_________________
Infos on wide tires, rims and aerodynamics


Top
   
PostPosted: Mon May 01, 2017 9:46 am 
Offline

Joined: Sun Jan 05, 2014 11:04 pm
Posts: 178
Location: Denmark
Beaver wrote:
25mm tire on 21c rim will be fine. 28mm tire on 17c rim won't. The tire will sit like a light bulb on the rim and you will not only destroy aerodynamics but also need to use a high tire pressure or it will feel squishy. And with the high pressure you will have vibrations again, which you won't have with the front wheel.

Maybe you can replace the rear rim?

https://www.lightbicycle.com/Road-bicyc ... lable.html

https://www.lightbicycle.com/Road-bicyc ... lable.html

Your current 17c 28mm wide rim sounds like Zipp - they are made for 23mm tires...



my Clement Strada LGG 28 mm on a fulcrum 17c rim doesn't feel squishy to me, i run 5 bar front and 5,5 rear.


Top
   
PostPosted: Mon May 01, 2017 9:55 am 
Offline
User avatar

Joined: Wed Aug 18, 2004 6:06 pm
Posts: 252
Location: Lower Saxony - Germany
What's your weight? Have you tried a 23mm tire with that pressure on the rim for comparison? Cornering should be much more precise.

_________________
Infos on wide tires, rims and aerodynamics


Top
   
PostPosted: Mon May 01, 2017 7:39 pm 
Offline

Joined: Wed Dec 30, 2015 12:41 am
Posts: 269
how about this then,
Front Vittoria 25c
Rear Conti 25c
It could be a good compromise in my case?

Beaver wrote:
Maybe you can replace the rear rim?

https://www.lightbicycle.com/Road-bicyc ... lable.html

https://www.lightbicycle.com/Road-bicyc ... lable.html

Your current 17c 28mm wide rim sounds like Zipp - they are made for 23mm tires...

I had an accident and replacing the front rim with LB 46mm you quoted, my current rear rim still work perfectly fine and i'm waiting for LB to release something 21mm internal,28-30mm external with depth of at least 50mm to replace my current rear rim. So i'll stick with what i have for rear for now. Thank you for suggestion.


Top
   
PostPosted: Mon May 01, 2017 8:27 pm 
Offline

Joined: Wed Aug 10, 2016 6:05 pm
Posts: 68
I agonized over tires prior to this season and finally bit the bullet on tubeless and went with the Pro Ones. Let me say, I am glad I did. Having a race that was a total washout they saved me a small wire puncture and the grip in the dry has been absolutely incredible. That is even comparing them to GPs. Longevity I haven't hit yet, but I am approaching the 1000 mile mark will no other issues. I liked them so much I purchased another set just in case these crap out.


Top
   
PostPosted: Mon May 01, 2017 8:42 pm 
Offline

Joined: Wed Jan 22, 2014 11:48 am
Posts: 2423
Location: Vienna Austria
25s or 28s on 17c will be perfectly fine.

The difference between Corsa G+ 25 and 28 (I have both) is minimal, less than a millimeter, and the weight is also nearly the same. The ride & performance is great though.


Top
   
PostPosted: Tue May 02, 2017 9:15 am 
Offline
User avatar

Joined: Wed Aug 18, 2004 6:06 pm
Posts: 252
Location: Lower Saxony - Germany
You can even run 35mm tires on 17c - but that's just far from ideal. You need too much pressure, because the tire would feel squishy and have a high rolling resistance elsewise. So there is no comfort gain, despite the wide tire and additional weight.

We started with 18mm tires on 14c rims. Then the tires got wider, but the rims didn't. You wouldn't do this on your car either.

If you tried a "slim" tire on a wide rim, you won't go back. And I am not the only one with these experiences:

https://intheknowcycling.com/2016/05/03 ... -upgrades/

_________________
Infos on wide tires, rims and aerodynamics


Top
   
PostPosted: Tue May 02, 2017 10:48 am 
Offline

Joined: Fri Nov 08, 2013 7:11 pm
Posts: 291
my personal experience.. switched to 25mm tyres on 15mm rims. It was horrible, went back to 22-23mm with less pressure: now it's much better in terms of comfort and handling.

with 25mm tyres on narrow rims, I either felt it wobbling in corners (with low pressure) or harsh and hard (higher pressure).

I'd go for 18-19mm rims with 23-24mm tyres If I'd have the money, but now, its out of question. With my oldschool rims, I'll stick to 22-23mm tyres with lower pressure. Better IMHO, than running wider tyres on the narrow rim..


Top
   
PostPosted: Tue May 02, 2017 8:22 pm 
Offline
User avatar

Joined: Tue Jul 26, 2016 8:43 pm
Posts: 200
Location: Los Angeles, California
There's much to like about the GP4000's, notably longevity and rollout. Very uniform tire and easy to mount.
But I'm a bit of a cornering demon, and the Conti's fall short of the Michelin Pro4, wet or dry. (Guessing same for their new Power, too.)
At the same 100 psi, the Pro4's feel superior, without the need to drop down to ridiculously low psi's and risk pinch flats.
Stocked up on the Conti's a year ago after finding around $30 apiece. Plan to return to the Michelin fold once my supply runs out by Fall.

_________________
Oldbie


Top
   
PostPosted: Wed May 03, 2017 10:17 am 
Offline

Joined: Sun Aug 02, 2015 7:50 pm
Posts: 254
Having been through several sets over the last year I can certainly comment from my perspective. I’ve been running my Campagnolo Bora Ultra 50C clinchers which are 17C inner and 24.2 outside.
I’ve run GP4000 IIs for years and have been very happy with them, before that I ran Vittoria Open Corsa CX’s in the summer and Michelin Pro Race (Axial Pro’s) the rest of the year all in 23 mm (maybe some 21 mm). 23’s pumped up 100 rear and 90 front.
The GP4000’s on the Boras came up at 25.1 mm so about the same as a 25mm tubular. They look wide and sit nicely with the rim. I did try 25 mm GP4000’s but they came up as 26.7 on the 17C Bora's which looked way too bit and would certainly not work well with the rim in terms or aerodynamics. The 23mm GP4000’s roll well and felt pretty comfortable and very very grippy (grippiest tyre I’ve ever used and I’m a terrible descender). No punctures till well over the 3000 mile mark and eventually removed them at about 4000 miles when they were still not down to the indicators but after a second punctures I decided to replace them. Would happily use again but have become bored by them.
Put on Michelin Power Competitions in 23mm which came up at 24.4mm. Fast on smooth tarmac but harsher than GP4000’s on bumpy tarmac. Got a puncture when a side wall went on the rear after 200 miles. Tyre destroyed. Put another on and that went, again on the side wall after another few hundred. Put another on and that was ok. Overall not impressed. Harsher than GP4000’s and less grippy on damp surfaces. Seem to be wearing much quicker than the GP4000’s. Won’t buy again.
Got a set of Specialized Turbo Cottons on at the moment and have done 500 miles so far. Came up at 25mm. They feel lovely. Very smooth and much better on all surfaces than GP4000’s and also feel more comfortable at the same time. Grip fine in the dry, not tried them in the wet. I don’t think they will last that well but we will see. They are noticeably thinner than the GP4000’s so I doubt they will be as puncture resistant but hopefully enough for a summer tyre. Very happy so far and for me the only viable alternative to the GP4000’s

_________________
Bianchi Oltre XR2 + Campagnolo Super Record 11 + Campagnolo Bora 50C
Litespeed T1 + Campagnolo Chorus 11 + Campagnolo Shamal Ultra


Top
   
PostPosted: Wed May 03, 2017 10:20 am 
Offline

Joined: Sun Aug 02, 2015 7:50 pm
Posts: 254
Asteroid wrote:
There's much to like about the GP4000's, notably longevity and rollout. Very uniform tire and easy to mount.
But I'm a bit of a cornering demon, and the Conti's fall short of the Michelin Pro4, wet or dry. (Guessing same for their new Power, too.)
At the same 100 psi, the Pro4's feel superior, without the need to drop down to ridiculously low psi's and risk pinch flats.
Stocked up on the Conti's a year ago after finding around $30 apiece. Plan to return to the Michelin fold once my supply runs out by Fall.


Funny that. I hate the Michelin's on corners and have crashed twice on dry Spanish roads on Pro Race 2's so that pit me off. The Power Competitions feels pretty much the same. I find the GP4000’s incredibly grippy (the ones with Black Chili) and have never had a moment wet or dry. I'm quite light which may make possibly a difference?

_________________
Bianchi Oltre XR2 + Campagnolo Super Record 11 + Campagnolo Bora 50C
Litespeed T1 + Campagnolo Chorus 11 + Campagnolo Shamal Ultra


Top
   
PostPosted: Wed May 03, 2017 2:41 pm 
Offline

Joined: Mon Jun 13, 2016 4:18 pm
Posts: 166
Haven't had a single pinch flat, puncture, or sidewall cut with 25c GP4000s on Kinlin XC 279 rims (17mm internal) at 85 PSI front, 90 PSI rear at rider weights as high as 93kg/205 lbs and the ride is sublime with great curve grip.


Top
   
PostPosted: Wed May 03, 2017 5:38 pm 
Offline

Joined: Tue Aug 18, 2015 1:47 pm
Posts: 64
So I have bought me a set of 25mm GP4000s, to replace my winter tyres; the Schwalbe Durano's.

I must say, the Durano's are offering very, very good grip. Actually they are the grippiest race tyres I have ever experienced !

Good, back to the GP4000s... Recently I have replaced my 15C Campy clinchers for 17C Vision clinchers just to ride the wider 25mm tyres. 25mm on 15C rims simply doesn't work in terms of looks, aerodynamics and especially the handling in corners IMHO.

Still, the GP4000s on my 17C rims look like small ballons, but within my tolerances. From that perspective the Durano's have a better fit, they just are one with the rim.

_________________
CAAD 10 2015


Top
   
Posted: Wed May 03, 2017 5:38 pm 


Top
   
 
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 51 posts ]  Go to page Previous 1 2 3 4 Next

   Similar Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. gp4000s 28mm on 21mm internal widht rims + 70kg rider ==> tyre pressure?

in Everything wheels

Delorre

10

1006

Wed Mar 29, 2017 8:49 pm

Delorre View the latest post

There are no new unread posts for this topic. GP4000S II faults- COMBINED POST

[ Go to page: 1 2 3 4 ]

in Everything wheels

ClydesdaleChris

52

4079

Mon Aug 14, 2017 4:11 am

lobuxracer View the latest post

There are no new unread posts for this topic. GP4000S II 28mm thoughts/ reviews?

in Everything wheels

ClydesdaleChris

9

1017

Fri Oct 13, 2017 9:29 pm

mpulsiv View the latest post

There are no new unread posts for this topic. CONTINENTAL COMPETITION PRO LTD TUBS

[ Go to page: 1 2 ]

in Everything wheels

dpw200

21

1670

Mon Jul 24, 2017 9:29 pm

petepeterson View the latest post

There are no new unread posts for this topic. 23 vs 25 tyre

[ Go to page: 1 2 ]

in Everything wheels

marshalus

21

2022

Thu Mar 30, 2017 8:05 pm

Calnago View the latest post


All times are UTC+01:00


Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Limited