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From: Jeff Liebermann <jeffl@cruzio.com>
Newsgroups: rec.bicycles.tech
Subject: Re: DeRosa Merak Rear Brake Problem
Date: Thu, 02 Jan 2025 17:20:38 -0800
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On Thu, 02 Jan 2025 16:08:19 GMT, cyclintom <cyclintom@yahoo.com>
wrote:

>On Thu Jan 2 09:46:17 2025 Zen Cycle  wrote:
>> 
>> It's a marketing name for the piece, but not necessarily anything odd. 
>> The "B-stay" is a Colnago proprietary seat-stay assembly of a rear 
>> "wishbone design", except that it's a modular formed CF piece designed 
>> to insert into a seat lug receiver and studs on the rear dropouts. IOW, 
>> it's only a "B-stay" when it's made by Colnago. It's not a "b-stay" on a 
>> DErosa Merak unless Derosa sourced the piece from Colnago. I believe 
>> Columbus made a similar piece under the "Curve" moniker.
>> 
>> > 
>> > I don't recall seeing any brake mounting hardware that took an M5 
>> > fastener. I think M6 is normal.
>> 
>> M6 is normal, the issue is that tommy is still under the impression that 
>> the screw size is defined by the drive tool, not the screw dimension 
>> (remember his insistence that the water bottle screws on his Basso were 
>> M4s).
>> 
>> I really can't say what a "normal brake lock" is. I suspect it's just 
>> the bolt, similar to how he called the cable clamp on the derailleur a 
>> "lock" recently.
>
>
>Proprietary? This is not an uncommon assembly. Though perhaps Colnago has rights to the name. I doubt that though since Trek made on before Colnago.
>
>De Rosa Macro Aluminum Carbon Frame - Size: ST 50 TT 53 - Light Blue | eBay

https://www.ebay.com/itm/146020934203

>Canyon road bike frame Air Road CF Team Omega Pharma-Lotto Model Carbon L Rare! | eBay

<https://www.ebay.com/itm/204948864806>

>Giant TCR Advanced SL Medium Frameset (Trek Cervelo Specialized Colnago Merckx) | eBay

No match found.

>Trek 120 OCLV Carbon Road Bike Frameset 58mm Large Made in USA Blue 2004 | eBay

<https://www.ebay.com/itm/396082900316>

I'll wait for Tom to post a photo of his  DeRosa Merak.


-- 
Jeff Liebermann                 jeffl@cruzio.com
PO Box 272      http://www.LearnByDestroying.com
Ben Lomond CA 95005-0272
Skype: JeffLiebermann      AE6KS    831-336-2558