Talking about replacing the P453 brake shoes on my TEKTRO R340 (actually R540) with Shimano R55C4.
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I replaced the brake shoes of the TEKTRO R340 (actually R540 when I took them off and looked at the back side) caliper brakes on my Giant Defy 2012 with Shimano R55C4 to increase the braking power.
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Apparently, the R55C4 is also the standard specification for DURA-ACE, ULTEGRA, and 105 as well as the R55 if you check the Brake (Caliper Brake) (pages 143~145) in the PDF file of the 2019-2020 Product Specifications (as of 11/13/2019) on the Shimano archive page below It looks like the C4.
The original brake shoes that came with the car were Tektro P453. It is not a cartridge type. It is not sold in Amazon now.
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After installing the Shimano R55C4, the brake shoe clearance was also adjusted with the centering adjustment screw and cable adjustment bolt.
I worked with this BR-R451 instruction manual and TEKTRO TECHNICAL SERVICE INSTRUCTION Dual Pivot Caliper Brak as a reference.
When you actually ride the bike, you can feel that the brake lever is stiffer when you hold it, and that the brakes work clearly with a “sizzle! You can feel that the brakes are clearly more effective. The brakes work even at high speeds, which gives you a greater sense of security.