Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Blog NEW Galleries NEW FAQ Contact About
It is currently Tue May 24, 2016 4:49 pm
Recently the board software has been updated and there are some known bugs/failures:
- Avatars are currently not being displayed ✔ FIXED
- Tapatalk connection is currently broken ✔ FIXED

If you find more errors please post it here: http://weightweenies.starbike.com/forum/viewtopic.php?f=7&t=139062


All times are UTC+01:00




Post new topic  Reply to topic  [ 12 posts ] 
Author Message
PostPosted: Tue Aug 12, 2014 4:00 pm 
Offline

Joined: Tue Aug 12, 2014 3:50 pm
Posts: 698
Location: FIN
Hi & Hello :) my 1st post here .

I'm bit confused… DT Swiss recommends for their carbon clinchers ( rrc46 c NOT DICUT / pre-dicut / ) tire size 19-23mm ( rim is 15c , and exactly 15mm inside ) , however everywhere for given(15c) rim size , and even Reynolds manual ( rim manufacturer ) MIN size is 23mm…

Installed 23mm Veloflex , looks on the rim bit narrow-ish for me… ( like 21mm tubular on 21mm rim ) - basically rim and tire are equal in width.

From the other hand, mounting bigger ( my "normal" is 25mm ) tires risking damaging rim ? :(

Max tire pressure on rim is estimated at 9bar, bit low for 23mm way low for 19mm….

Any thoughts ?

_________________
Go to Heaven for the climate, Hell for the company.
Mark Twain


I can be wrong, and have plenty of examples for that ;)


Top
   
PostPosted: Tue Aug 12, 2014 7:30 pm 
Offline

Joined: Fri May 25, 2007 6:43 pm
Posts: 2628
9 bar is actually rather high.


Top
   
PostPosted: Tue Aug 12, 2014 8:07 pm 
Offline

Joined: Tue Aug 12, 2014 3:50 pm
Posts: 698
Location: FIN
Pressure doesn't bother me at all, on Conti 4000sII 25mm I use 7,5R/6.5F on Veloflex Corsa 8R/7F - my only issue is 25mm on these rims - is it "safe" or absolutely not ?

I know that some manufacturers are very restrictive , just "in case" , some give real limits, some do not at all ( for wieght f.e. ), …

Logically, I should follow "standarts" ( 23-28mm for 15c rim ) , but instruction attached to wheels and even decal on rims says "19-23mm"… In alu - I don't hesitate to use 32mm on 13c rim , but carbon clincher is different "animal".

So, I asked here, maybe someone has experience with these ?

_________________
Go to Heaven for the climate, Hell for the company.
Mark Twain


I can be wrong, and have plenty of examples for that ;)


Top
   
PostPosted: Tue Aug 12, 2014 9:51 pm 
Offline
in the industry

Joined: Sat May 12, 2012 7:25 pm
Posts: 2549
Location: Glermsford, Suffolk U.K
19-23mm tyres will be for aerodynamic benefit. A 25mm tyre will fit fine.

_________________
www.thecycleclinic.co.uk


Top
   
PostPosted: Wed Aug 13, 2014 5:02 am 
Offline

Joined: Tue Aug 12, 2014 3:50 pm
Posts: 698
Location: FIN
Thnx ! but ( :) ) are you sure ? DT says "Max tire width 23mm" not like "recommended" or so ….

_________________
Go to Heaven for the climate, Hell for the company.
Mark Twain


I can be wrong, and have plenty of examples for that ;)


Top
   
PostPosted: Wed Aug 13, 2014 8:00 am 
Offline

Joined: Fri May 25, 2007 6:43 pm
Posts: 2628
I would imagine that the max tyre size is closely linked to the maximum pressure. So a 23mm tyre at 9 bar is the edge of the envelope, plus a significant margin. Much like stans rims. Narrower tyres = higher pressures.
If you are below the max pressure and above the max size, as long as you aren't doing anything daft (CX tyres at 8 bar) I'd not lose any sleep.

FWIW, the relatively low max rated pressure is probably thanks to the tendency for carbon clinchers to let go of the tyre/tube under prolonged vigorous braking and the related heat build up. (Descending mountains, badly)


Top
   
PostPosted: Wed Aug 13, 2014 9:30 am 
Offline

Joined: Tue Aug 12, 2014 3:50 pm
Posts: 698
Location: FIN
Thank you. I thought same, but good to have "confirmation" :)

I live in relatively flat area ( about 1% (1500-1600m) average climb-descent on 150km ) and wheels will be used only for road, which aren't so bad .

On CX open tubulars I'm like 2,5 rear and 2.0 front - being 85kg :) fortunately no flats yet ( grifo ).

Anyway, I think topic can be closed.

Thanks again.

_________________
Go to Heaven for the climate, Hell for the company.
Mark Twain


I can be wrong, and have plenty of examples for that ;)


Top
   
PostPosted: Thu Aug 14, 2014 10:33 am 
Offline

Joined: Tue Aug 12, 2014 3:50 pm
Posts: 698
Location: FIN
Asked DtSwiss for info , received answer :

Thanks for your mail and that you are riding on our DT Swiss wheels.
I would and I cannot recommend wider tires than 23mm. We did not test these wheels with wider tires than 23mm, there fore we cannot warranty for the good function and the long live of the rim, when you are using other tire dimension, than DT Swiss officially recommend.

Sorry for not giving better information for you.

Thanks for understanding

Freundliche Grüsse / Best regards
Daniel Wyder
International Service & Customer Support Manager
DT Swiss AG

_________________
Go to Heaven for the climate, Hell for the company.
Mark Twain


I can be wrong, and have plenty of examples for that ;)


Top
   
PostPosted: Thu Aug 14, 2014 3:28 pm 
Offline
User avatar

Joined: Mon Feb 19, 2007 7:26 am
Posts: 1936
Location: Atlanta, GA, US
That is an idiotic, cover-your-ass response from DT.

Run 25 mm tires, the wheels will be fine.

_________________
My Bikes

My Photoblog


Top
   
PostPosted: Thu Aug 14, 2014 4:40 pm 
Offline

Joined: Mon Aug 20, 2012 12:12 pm
Posts: 542
Location: Oop North
Considering I've seen these rims used in CX races, I don't think you'll have any issue with 25mm.


Top
   
PostPosted: Thu Aug 14, 2014 6:56 pm 
Offline

Joined: Fri May 25, 2007 6:43 pm
Posts: 2628
Which basically means, "we are bone idle and couldn't be bothered to test properly, Fredrik in marketing has run a pair with 23s, so you should be ok"


Top
   
PostPosted: Sat Aug 16, 2014 9:20 pm 
Offline

Joined: Tue Aug 12, 2014 3:50 pm
Posts: 698
Location: FIN
I'm after 1st "test" ride on Conti gp400sII 25mm (26mm on these rims) and all looks/feels fine :) pressure F:6,1 R: 7 bar . Tires are easy to install on these rims ( however has about 1000km so are bit strechted already ) - what a change after Vision :)

_________________
Go to Heaven for the climate, Hell for the company.
Mark Twain


I can be wrong, and have plenty of examples for that ;)


Top
   
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 12 posts ] 

   Similar Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. Cannondale System Six and tire size.???????

in Road

upside

1

186

Mon Feb 15, 2016 2:31 am

53x12 View the latest post

There are no new unread posts for this topic. Which tire would you go for?

in Cyclocross / Touring

wheelsONfire

0

5

Tue May 24, 2016 3:20 pm

wheelsONfire View the latest post

There are no new unread posts for this topic. Rim and tire widths for CX

[ Go to page: 1 2 ]

in Cyclocross / Touring

the_marsbar

15

917

Fri Dec 18, 2015 11:51 pm

the_marsbar View the latest post

There are no new unread posts for this topic. What tubular tire should I go with?

[ Go to page: 1 2 3 ]

in Road

nelsonivan

33

3244

Tue Sep 08, 2015 5:12 pm

sawyer View the latest post

There are no new unread posts for this topic. Colnago C60 tire clearance

in Road

Faapaa

6

712

Wed Oct 21, 2015 3:40 pm

Faapaa View the latest post


All times are UTC+01:00


Who is online

Users browsing this forum: No registered users and 3 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