R
Roger Merriman
Guest
Tony Raven <[email protected]> wrote:
> [email protected] (Roger Merriman) wrote in
> news:1i3v58y.5ykd2y1onief8N%[email protected]:
>
> > Tony Raven <[email protected]> wrote:
> >
> >> [...]
> >
> > indeed, the chances of attaully heating a rim or disk on normal bike
> > seem slim.
>
> Not slim at all on a long descent
okay not something i've ever had a problem with but then the geography
means you don't tend to get long fast descents but short and sharp.
ie it might be over 30% or more in places but you'll reach the bottom
before the heat of the rim starts to be a issue.
>
> > and attaully looking and tamdems they seem to have bog
> > standurd brakes, mostly V brakes with the drum to assist. does also beg
> > the question if heat is a problem then why use the rim with the risks
> > that come with that. but use a disk where if it gets hot it shouldn't
> > cause any problems bar brake fade.
> >
> > does suggest that braking is heat rather than stronger brakes, for the
> > tamdems.
> >
>
> You can use disks but you need them designed for tandem heat loads that
> most of them are not. A disk could not be used with a drum on the rear
> wheel because the drum takes up the disk space - so you are going to need
> a rim brake on the back anyway - unlike singles rear brakes are effective
> on tandems. So that leaves you with just a front disk.
ah righty that kinda makes sence. i guess that disks big enought to
disapate the heat would start to get seriously heavy. as car and
motorbike disks are.
roger
--
www.rogermerriman.com
> [email protected] (Roger Merriman) wrote in
> news:1i3v58y.5ykd2y1onief8N%[email protected]:
>
> > Tony Raven <[email protected]> wrote:
> >
> >> [...]
> >
> > indeed, the chances of attaully heating a rim or disk on normal bike
> > seem slim.
>
> Not slim at all on a long descent
okay not something i've ever had a problem with but then the geography
means you don't tend to get long fast descents but short and sharp.
ie it might be over 30% or more in places but you'll reach the bottom
before the heat of the rim starts to be a issue.
>
> > and attaully looking and tamdems they seem to have bog
> > standurd brakes, mostly V brakes with the drum to assist. does also beg
> > the question if heat is a problem then why use the rim with the risks
> > that come with that. but use a disk where if it gets hot it shouldn't
> > cause any problems bar brake fade.
> >
> > does suggest that braking is heat rather than stronger brakes, for the
> > tamdems.
> >
>
> You can use disks but you need them designed for tandem heat loads that
> most of them are not. A disk could not be used with a drum on the rear
> wheel because the drum takes up the disk space - so you are going to need
> a rim brake on the back anyway - unlike singles rear brakes are effective
> on tandems. So that leaves you with just a front disk.
ah righty that kinda makes sence. i guess that disks big enought to
disapate the heat would start to get seriously heavy. as car and
motorbike disks are.
roger
--
www.rogermerriman.com