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From: Zen Cycle <funkmaster@hotmail.com>
Newsgroups: rec.bicycles.tech
Subject: Re: DeRosa Merak Rear Brake Problem
Date: Fri, 3 Jan 2025 08:27:09 -0500
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On 1/2/2025 8:20 PM, Jeff Liebermann wrote:
> 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.
> 
> 


Of the 3 frames tom posted which have valid links, only the De Rosa has 
the configuration we're discussing. The Canyon and TreK are both full 
carbon lugless designs. The Giant TCR series never used a hybrid 
carbon/Al construction. As for the DeRosa, the seat stay assembly is 
likely a generic component sourced from a Taiwanese vendor. As I 
mentioned, "B-Stay" is a Colnago trademarked marketing term for their 
design. Tommy is attempting to genericize the term.

-- 
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