Problem: chain idler, crossbar, chainline

Risto, try an office supply store and buy a sheet of adhesive backed mylar (polyester film)
laminating (page protector) film. Cut a strip and put it over the cross bar. This stuff is
hell-for-stout. I used to use it on my aluminum framed Proflex MTB to keep gritty cable housings
from grinding their way through the downtube and fork legs.
<[email hidden]> wrote in message
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Quoted message said:

Have a little problem with my Steintrikes Viper: the chainline goes very close to the crossbar,
and seems the chain occasionally rubs/eats on the crossbar.

I have a 80 mm idler wheel at the moment, and a Sora 53/39 double. The current crankset only gives
me around 42 km/h at 100 rpm. Though I find a cadence of 110 still quite comfortable, and 120
could be ok for sprints. (My normal, cruising cadence with 175 mm cranks is 95-110.) I put three
washers in place (plus an aluminium sheet) for spacing. Their problem is that the locknut can't
engage and will become loose when riding. It never fell off yet, though.

Any suggestions? Now I'm thinking maybe I should go to 100 mm idler wheel - would 90 mm ones be
available somewhere? 100 mm would chop off 10 mm of the ground clearance, but the idler is very
close to wheel axles so I guess it doesn't matter, especially when the chain is very low
hanging... With 100 mm idler I could get any chainring I need, I bet.

Maybes I should take a good picture...

--
Risto Varanka | helsinki.fihpv.htmlOpen ↗ varis at no spam please iki fi

harv <[email hidden]> wrote:
: Risto, try an office supply store and buy a sheet of adhesive backed mylar (polyester film)
: laminating (page protector) film. Cut a strip and put it over the cross bar. This stuff is
: hell-for-stout. I used to use it on my aluminum framed Proflex MTB to keep gritty cable housings
: from grinding their way through the downtube and fork legs.

Ah, thanks for the tip, could make the problem less severe... if I can gather what the stuff is
called here... what it's for, originally? I think one could alternatively use the protection
stickers that usually go in chainstays? I'd need some extra protection there too, the chain hits
against the chainstay in many places because of bumps and such.

--
Risto Varanka | helsinki.fihpv.htmlOpen ↗ varis at no spam please iki fi

<[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

harv <[email hidden]> wrote:
: Risto, try an office supply store and buy a sheet of adhesive backed

mylar

Quoted message said:

: (polyester film) laminating (page protector) film. Cut a strip and put

it

Quoted message said:

: over the cross bar. This stuff is hell-for-stout. I used to use it on my aluminum framed Proflex
: MTB to keep gritty cable housings from grinding their way through the downtube and fork legs.

Ah, thanks for the tip, could make the problem less severe... if I can gather what the stuff is
called here... what it's for, originally? I think one could alternatively use the protection
stickers that usually go in chainstays? I'd need some extra protection there too, the chain hits
against the chainstay in many places because of bumps and such.

I use "Print Dekal" on my daughters homebuild :
hpv-klub.dkimg 2310.jpgOpen ↗ You can get it here :
printpromotion.seframeps.htmOpen ↗ - i got mine from www.hocotec.dk, but they're down atm.

Regards, Torben