Quantcast

Hammerschmidt on ISCG adapter.... Here we go!

Delimeat

Delimeat

Monkey
Feb 3, 2009
195
0
Canada
So I have this here Hammerschmidt sitting about and would love to go ahead and bolt it onto which ever frame I eventually decide on. One problem though: My top few picks (Trek Remedy or Giant Reign) don't have ISCG tabs on them. The boys at SRAM have made quite the hullabaloo about mounting up their H.S. cranks correctly and only on approved bikes, which I respect, but don't fully believe. The main issue they seem to be concerned about is rotation of the back plate, either from cable tension or hits from below. Having run guides long before any ISCG standard was around, I call B.S. on the first worry, I don't see cable tension pulling hard enough to rotate the back plate/ISCG adapter. As for hitting the guard, there is no boomerang to catch and rotate so I see it just glancing off objects.

SRAM also insists upon a faced surface on the ISCG tabs, which makes sense. I have a few different ISCG adapters I could use, all are perfectly flat. After I face the BB shell there is no reason why it wouldn't be just as flat and square as built in tabs.

So what are your opinions? Has anyone out there used a ISCG adapter to install their Hammerschmidt? I guess the disclaimer would be to say that I am really not all that worried about cutting something up, or coming to the conclusion that it won't work, as the bits are somewhat disposable.

Ideas, opinions, experience w/ this project?
 
C

Cuprinol

Chimp
Mar 22, 2005
61
0
Bumping this thread!

How did it turn out for you? Did you modify your frame or buy a new one?

I'm in the same boat now, my quake needs some mods to make it work with hammerschmidt. First i thought welding, but there is risk for metal fatigue blabla. Then maybe some splines or threads on a iscg adapter plate/bb tube would do the trick. Any ideas on a non welding way of doing this that doesnt involve buying a new frame?
 
P

PhilipW

Monkey
Mar 13, 2007
311
0
Leominster, MA
No matter what you do, the adapter cannot physically be able to rotate. HS overdrive aparantly puts a TON of force on the tabs, which is why Sram insists on welded on tabs.

-pw
 
C

Cuprinol

Chimp
Mar 22, 2005
61
0
If you havent seen it already, a couple of guys on the mtbr forum has posted succesful results doing this without much hazzle.
 
Mr Jones

Mr Jones

Turbo Monkey
Nov 12, 2007
1,475
0
If I could afford a Hammy, I wouldn't trust it on a ISCG adapter. I've seen chain guides after a crash that have moved because the force of the impact moved the adapter. Last thing I want is to be stuck in some gawd forsaken valley 15 miles from the nearest BB tool.
 
samnation

samnation

Monkey
Jan 25, 2009
139
0
Somewhere in KANURDUR
PhilipW said:
No matter what you do, the adapter cannot physically be able to rotate. HS overdrive aparantly puts a TON of force on the tabs, which is why Sram insists on welded on tabs.

-pw
Click to expand...
I've been told that formed tabs are much better than welded but that wasn't by sram. I've always wondered if i can put one on my bike with welded tabs.

A friend of mine had a set on a randsom and broke his frame, got a voltage on warrenty and didn't have a facing tool handy, so just threw it on and worked fine.
 
P

PhilipW

Monkey
Mar 13, 2007
311
0
Leominster, MA
Ah, I mis-typed.

One piece forged/CNC BB shells with ISCG are typically much better than a drilled and threaded metal ring spot welded around a BB shell...typically in terms of fatigue strength:
Spot Welded < Full Welded < One Piece CNC/Forged.

For Hammerschmidt, where impact strength isn't as much a concern as it would be on say a DH race rig, any tabs should be fine...

Cheers,
pw
 
DHS

DHS

Friendly Neighborhood Pool Boy
Apr 23, 2002
5,094
0
Sand, CA
have had a couple locals setup the crank with a adapter plate. its not the bashing of it that's the problem. its the hard shifting loads that matter more. I've seen 2 shear off in the past 8months.

true i don't know if they set it up correctly. but if you get a 2nd chance, usually you should take precautions.

and yes i own one, on a 2010 enduro
 
samnation

samnation

Monkey
Jan 25, 2009
139
0
Somewhere in KANURDUR
PhilipW said:
Ah, I mis-typed.

One piece forged/CNC BB shells with ISCG are typically much better than a drilled and threaded metal ring spot welded around a BB shell...typically in terms of fatigue strength:
Spot Welded < Full Welded < One Piece CNC/Forged.

For Hammerschmidt, where impact strength isn't as much a concern as it would be on say a DH race rig, any tabs should be fine...

Cheers,
pw
Click to expand...
No worries thought it might have been a mistype.
 
You must log in or register to reply here.
Top Bottom