SRAM Guide RE calipers matched with Code RSC lever assemblies

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SRAM Guide RE calipers matched with Code RSC lever assemblies
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Posted: Dec 5, 2021 at 17:39 Quote
I have some Sram Guide T on a bike and I want to upgrade the levers to Code RSC as I found a good deal. Any experience with this combination? Thanks

Posted: Dec 5, 2021 at 19:16 Quote
Red-October wrote:
I have some Sram Guide T on a bike and I want to upgrade the levers to Code RSC as I found a good deal. Any experience with this combination? Thanks

You will effectively have Guide RSC brakes.

Posted: Dec 6, 2021 at 9:18 Quote
rete wrote:
But SRAM's Swinglink doesn't function in the same way; with Swinglink (compared to Directlink in the R lever) each mm of lever pull produces more pressure early in the lever stroke but produces less pressure later in the lever stroke.

Its actually the opposite: Swing Link is a rising rate, not a falling rate. SRAM brakes get more power later in their stroke (rising rate of piston movement = "modulation") as opposed to Servo Wave, which is a falling rate and gets more power very early (faster initial piston movement = "initial bite").

A pretty important point too, the lever rate does not on its own dictate pressure. The pressure applied is a function of the piston ratio (slave piston π r² / mc π r²).

Relevant to the thread and SRAM brake mix/match, something worth noting is that the master cylinder piston is identical (same part number, seals) between all Guides and Codes of the current gen. The differences are most importantly in lever link design, reservoir size (important for large surface area calipers due to fluid displacement, although we already know Guide/G2 levers 'work' with Code calipers) and caliper piston size.

Posted: Dec 6, 2021 at 11:33 Quote
HaggeredShins wrote:
Relevant to the thread and SRAM brake mix/match, something worth noting is that the master cylinder piston is identical (same part number, seals) between all Guides and Codes of the current gen. The differences are most importantly in lever link design, reservoir size (important for large surface area calipers due to fluid displacement, although we already know Guide/G2 levers 'work' with Code calipers) and caliper piston size.

Lever link design and linkage parts is the same between Guide and Code levers. The "swinglink" cam in kit 11.5018.005.010 is both the Guide's and Code's.

The lever blade itself is the same between Guide and Code levers - part 11.5018.003.014 is both the Guide's and Code's.

HaggeredShins wrote:
reservoir size (important for large surface area calipers due to fluid displacement)

Second gen codes, with taper bore levers and the same caliper slave piston area, had significantly small total fluid volume compared to even Guide and Level brakes - and they produced the same or more ultimate power without heat fatigue. The Guide RE is still SRAM's most powerful brake, even with smaller fluid volume but at the same time more caliper metal.

Posted: Dec 6, 2021 at 13:44 Quote
rete wrote:
Lever link design and linkage parts is the same between Guide and Code levers. The "swinglink" cam in kit 11.5018.005.010 is both the Guide's and Code's.

The lever blade itself is the same between Guide and Code levers - part 11.5018.003.014 is both the Guide's and Code's.

You're correct, SRAM's parts catalogue indicate the only difference is in lever body and res cap. I'd be interested to put them side by side to see if the linkage points vary (probably don't)

rete wrote:
Second gen codes, with taper bore levers and the same caliper slave piston area, had significantly small total fluid volume compared to even Guide and Level brakes - and they produced the same or more ultimate power without heat fatigue. The Guide RE is still SRAM's most powerful brake, even with smaller fluid volume but at the same time more caliper metal.

Heat management isn't exactly the point (and res volume doesn't otherwise have anything to do with brake power). Reservoir capacity is important for someone who, say, might try to plug a Northfork caliper into a Guide lever. We don't know if that's going to work safely because no one to our knowledge has tested it yet with worn pads (although if someone would like to pitch me half a grand or a couple stoppers I'd be happy to test it out).

On paper the RE and gen 3 brakes are pretty much identical (15/16 pistons, same mc), so your observation probably comes down to the linkage (is it an R or RE?) or pads, unless the gen 2 caliper is truly stiffer. I'm not a brake dyno and can't tell the difference between the two calipers with the same lever.

Posted: Dec 6, 2021 at 16:09 Quote
HaggeredShins wrote:
You're correct, SRAM's parts catalogue indicate the only difference is in lever body and res cap. I'd be interested to put them side by side to see if the linkage points vary (probably don't)

They are visually identical - I own Code RSC, Guide RSC , Guide R/RE and G2 R - and have addressed "sticky lever" in the first 3 by disassembling and sanding the master piston.

HaggeredShins wrote:
Its actually the opposite: Swing Link is a rising rate, not a falling rate. SRAM brakes get more power later in their stroke (rising rate of piston movement = "modulation") as opposed to Servo Wave, which is a falling rate and gets more power very early (faster initial piston movement = "initial bite").

Yeah, I had this graph in mind but forgot the details of who's who on it - comparative graph of essentially Guide R vs Guide RSC/Code RSC vs Shimano Servo-Wave.


Posted: Dec 6, 2021 at 16:50 Quote
Interesting, I don't think I've seen that graphic before--still a falling rate even if a lot more progressive than Shimano. I remember having a SRAM tech explain that SwingLink was doing the same thing as whatever the old tech was called (deep stroke something), which was marketed as a rising rate for modulation, although this looks like power will taper off with the current design.

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