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Echo external + reset ti = new bb ( pic heavy + boring )


Alex Dark

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Got bored after work the other day and had nothing to do so had a bash at combining the best BB axle i had ( reset ti ) with the best cups/bearings i had ( echo external )

The idea was to replace the inner sleeves that sit between the bearings and axle ( and cover the outer surfaces of the bearings ) with new Stainless versions ( same as orig. ) that would change the axle diameter from 25mm to the reset's 21.5mm, also to account for the narrower offset between bearings ( by making each top hat sleeve longer by half the difference).

Here's the toolpath....

img0156pe.jpg

Drilled out to 21~mm then bored out to 21.5mm with a small screwcutting bar. ( left u/s by 0.01mm to be polished out )

turned the inner end to 25mm ( +\- 0.005mm ) allowing the bearings to tap on.

img0165ei.jpg

External groove to create the chamfer you can see from the outside

Parted off at .4 mm o/s

Faced to length, then polished to give tap fit onto axle.

Finished product; yet to fit and try.

img0167th.jpg

img0169dx.jpg

img0170qf.jpgFor anyone thats interested im a bit of a newb to this, but using an XYZ 425 prototrak.

Hopefully give a nice light BB but with decent bearings......if this doesnt work ill just get some Enduro bearings and rebuild it as a full Reset unit anyway.

Also modded my Mg1's; didnt fancy cutting or milling the centres but needed them to be more concave...so used a ball nose and removed most of the material and left some nice little grooves for grip :)

img0162cs.jpgimg0164zc.jpg

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Innovation. I did something similar to this for a mate, made him some cups to convert a Spanish bb frame to run shimano bolt through cranks, a top hat design similar to yours. It was basically a set of threadless bearing cups with a 4mm offset to the drive side, that press into the frame, and then take shimano bb bearings. It will work on any frame with a Spanish bb, so in theory you can run saints on a BMX etc etc

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Innovation. I did something similar to this for a mate, made him some cups to convert a Spanish bb frame to run shimano bolt through cranks, a top hat design similar to yours. It was basically a set of threadless bearing cups with a 4mm offset to the drive side, that press into the frame, and then take shimano bb bearings. It will work on any frame with a Spanish bb, so in theory you can run saints on a BMX etc etc

Thats a pretty sweet idea... really similar!

Nice work! How has making the pedals more concave at just that point improved them? I would have thought it would need to gradually dip down rather than suddenly like yours? Not a criticism, just curious!

Basically your foot sits into the pedal more, for instance I hate echo pedals ( dunno which ones they are, the real flat platform ones ) and love my mates v12s he hacked into with a grinder... with knackered pins i slipped far less than with my mg1's and felt more secure too.

Id either have to do it as a step, or program a 3d toolpath and it really wasnt worth the hassle...that was just done on a manual mill by eye in under 20mins as a bodge.

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Nice job mate lucky to have acces to the equipment. Only thing I can see that might cause a problem is the fit. Might be a bit slack and cause it to creak when you ride.

Yeh it probably wont work to be fair but was interesting doing it anyway.

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