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Tour Easy: SRAM Grip Bushing

After installing the X.0 shifter, I sprang for new grips:

Tour Easy - SRAM X.0 grip shifter - new grip with bushing
Tour Easy – SRAM X.0 grip shifter – new grip with bushing

They’re 90 mm long, which turned out to be 4 mm shorter than the grips that came with the bike; a close look showed the original ones were cut down from SRAM’s 110 mm grips.

Well, I can fix that:

Tour Easy - SRAM grip bushings
Tour Easy – SRAM grip bushings

Ordinarily, you’d just move the brake levers by 4 mm and declare victory. In this case, moving the right lever would be easy, but the left one is firmly glued in place by the radio’s PTT button:

PTT Button - rounded cap
PTT Button – rounded cap

Believe me, solid modeling is easy compared to redoing that!

The OpenSCAD source code doesn’t amount to much:

// SRAM grip shifter bushings
// Ed Nisley KE4ZNU March 2019

Protrusion = 0.1;           // make holes end cleanly

//----------------------
// Dimensions

ID = 0;
OD = 1;
LENGTH = 2;

Bushing = [22.2 + 0.5,31.0,4.0];        // ID = E-Z slip fit

NumSides = 2*3*4;

//----------------------
// Build it!

difference() {
  cylinder(d=Bushing[OD],h=Bushing[LENGTH],$fn=NumSides);
  translate([0,0,-Protrusion])
    cylinder(d=Bushing[ID],h=Bushing[LENGTH] + 2*Protrusion,$fn=NumSides);
}

I loves me my 3D printer …

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