* *

Picture Bit

            

Welcome, Guest. Please login or register.
Did you miss your activation email?
October 03, 2022, 06:51:52 am

Login with username, password and session length

Members
Stats
  • Total Posts: 32000
  • Total Topics: 3961
  • Online Today: 10
  • Online Ever: 235
  • (December 09, 2019, 06:27:14 pm)
Users Online
Users: 0
Guests: 4
Total: 4
4 Guests, 0 Users

Author Topic: Tube Trouble  (Read 1137 times)

spikebender

  • Journeyman
  • ***
  • Posts: 108
  • Karma: 2
  • My 855
Tube Trouble
« on: November 03, 2020, 02:37:18 pm »
Hey Group, hope everyone is well. I have to be honest on this one--- out of ALL the bikes I've had my entire life my 757 is the first one I've used Presta valves for my set up. Problem is now (front only) is the stem pulls away from the tube do I need to double nut the stem? I always have the proper pressure and they were quality tubes. This makes twice any help would be appreciated.
                                                                                                  Thanks, Tracy
757
855
Custom trailer (thanks Papa)

Colin

  • Guru
  • *****
  • Posts: 1242
  • Karma: 14
  • in a village near Northampton, UK
Re: Tube Trouble
« Reply #1 on: November 12, 2020, 09:10:42 am »
The question is what diameter valve are the rims drilled for?
Presta valves are only 6mm dia, whereas Schrader are 8mm.
If you use Presta tubes in a Schrader drilled rim, then yes, you run the risk of the tube bulging up through the hole and ripping the tube especially if you're at all rough with them during vigorous pumping (Phewerrrr!) <GRIN>

If this is the issue then you need a "Schrader Drilled Rim to Presta Valve Reducer Grommet"

https://www.ebay.co.uk/i/264720447429

Or here's a sexier and elegant solution:
https://www.ebay.co.uk/itm/Bike-Schrader-Presta-Valve-Bicycle-Wheel-Converter-Nut-Rim-Conversion-Nut-W0R2-/293803825967?_trksid=p2385738.m4383.l4275.c10

I use both valves on my bikes, just depends upon the rim.

Col.
« Last Edit: November 12, 2020, 09:16:55 am by Colin »
2001 OzM
2000 OzX
1999 x500
1999 900 Frame
1998 4000se
1998 4000
1997 957 Frame
1997 857 Frames
1997 XP-X (856)
1995/6 x55/x56 Frame
1992 962 Frame
1991 Marin Pine Mountain with a Flex Stem

spikebender

  • Journeyman
  • ***
  • Posts: 108
  • Karma: 2
  • My 855
Re: Tube Trouble
« Reply #2 on: November 17, 2020, 06:11:45 pm »
They haven't been drilled out or modified but now that I think about it they are double walled the inside hole may be larger gonna check that out right now.
757
855
Custom trailer (thanks Papa)

Colin

  • Guru
  • *****
  • Posts: 1242
  • Karma: 14
  • in a village near Northampton, UK
Re: Tube Trouble
« Reply #3 on: November 24, 2020, 08:34:13 am »
Hopefully not modded as that will probably cause a nice sharp edge to cut your tube!
When I say "drilled" I mean "manufactured/designed"

Bottom line is, measure the diameter of the hole.
or, if a Presta valve rattles around in it and a Schrader is a nice snug fit then you need to use Schrader or get an adapter grommet and yes possibly on the inside as well, all in all, best to use the valves the rim is designed for........

Col.
2001 OzM
2000 OzX
1999 x500
1999 900 Frame
1998 4000se
1998 4000
1997 957 Frame
1997 857 Frames
1997 XP-X (856)
1995/6 x55/x56 Frame
1992 962 Frame
1991 Marin Pine Mountain with a Flex Stem

spikebender

  • Journeyman
  • ***
  • Posts: 108
  • Karma: 2
  • My 855
Re: Tube Trouble
« Reply #4 on: March 29, 2021, 02:16:09 am »
 Problem fixed, the rims I'm using are double walled. The inside hole was a little larger the outer. So I took a presta nut and a Dremel and tapered it then ran that on the stem first and nutted the outer stem.
757
855
Custom trailer (thanks Papa)