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Hope C2 hose choice
http://www.retrobike.co.uk/forum/viewtopic.php?f=41&t=214750

Author:  dyna-ti [ Mon Aug 06, 2012 5:06 pm ]
Post subject:  Hope C2 hose choice

Does the size of the hose matter and would changing to a 5mm one cause any changes :?
Does it increase the force any?

Discussion needed :D

Author:  cyfa2809 [ Mon Aug 06, 2012 5:54 pm ]
Post subject: 

The inner diameter is the same isnt it? (if so = no change).
And even if it was bigger or smaller i think it depends on the master cylinder and how much fluid it moves, i.e it will still only move the same amount.
:?:

Author:  suburbanreuben [ Mon Aug 06, 2012 8:03 pm ]
Post subject: 

No problems changing size, except you'll need new banjos too...

Author:  ti-fat-man [ Mon Aug 06, 2012 11:51 pm ]
Post subject: 

I need the 6mm hose for a frame that has eyelets machined for the bigger size, the smaller 5mm hose doesn't fit snug in the holes and slops about!
Does anyone have a lead as to where to source the 6mm hose?

Author:  cyfa2809 [ Tue Aug 07, 2012 5:51 pm ]
Post subject: 

http://www.rushcycles.co.uk/m2b7s331p2679/HOPE-6mm-Braided-Hose-Front-1mtr

And on ebay also i think.

Author:  dyna-ti [ Tue Aug 07, 2012 5:54 pm ]
Post subject: 

Actually i would have thought just the fact youve reduced the bore by a 1mm would increase the pressure :?

Author:  cyfa2809 [ Tue Aug 07, 2012 6:35 pm ]
Post subject: 

I always thought it was just the outer diameter that changed?

Author:  dbmtb [ Tue Aug 07, 2012 10:08 pm ]
Post subject: 

5mm hose is stiffer - that's why they changed to it.

I've run Minis and DH4s with both and they work fine.

Slightly less spongey feel with 5mm - to the extent that I sent the last of my spare 6mm hose to the chap who bought my M4s last week, I won't be using it again - as I'm not that much of a purist. Only running it on my RC200 with C2s to keep it original but performance is not the same as with 5mm.

Author:  suburbanreuben [ Tue Aug 07, 2012 10:29 pm ]
Post subject: 

dyna-ti wrote:
Actually i would have thought just the fact youve reduced the bore by a 1mm would increase the pressure :?

No... Same fluid in = same fluid out.

Author:  dyna-ti [ Tue Aug 07, 2012 10:35 pm ]
Post subject: 

suburbanreuben wrote:
dyna-ti wrote:
Actually i would have thought just the fact youve reduced the bore by a 1mm would increase the pressure :?

No... Same fluid in = same fluid out.


Indeed but to increase the pressure of any liquid passing through a tube is you decrease the inner diameter.
plus you increase the speed of passage :?

Author:  suburbanreuben [ Tue Aug 07, 2012 10:47 pm ]
Post subject: 

dyna-ti wrote:
suburbanreuben wrote:
dyna-ti wrote:
Actually i would have thought just the fact youve reduced the bore by a 1mm would increase the pressure :?

No... Same fluid in = same fluid out.


Indeed but to increase the pressure of any liquid passing through a tube is you decrease the inner diameter.
plus you increase the speed of passage :?

In the pipe, yes, but you still have exactly the same quantity of fluid entering the caliper cylinder that leaves the master cylinder. Hence any improvement in braking is due to the increased stiffness of the hose wall, not the tube bore.

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