brickhouseracing

January 7, 2012

X.0 Crank Project

Filed under: Around the shop — Andrea @ 8:16 am

I’ve been through a couple of different cranks on the singlespeed-

First was an E.13 crank. It was cool since it wasn’t incredibly expensive, was lighter than other aluminum cranks, and had a super-stiff 30mm spindle. I had some issues with adjustment, though- you have to install it, test for play, then use any number of tiny plastic spacer rings to get rid of the play. Use too many, and the crank will load the bearings up when you install it. Don’t use enough, and the crank will have play in it. My issue came when the plastic spacers started to wear. The crank started to wiggle… during the Fool’s Gold 100 last year. I repeatedly stopped to re-tighten, but every time, I was having to tighten it to the point of squeezing the bearings and causing a lot of drag, eventually killing the BB bearings. This sucks ass when you’re trying to race 100 miles.

Next, I broke out my old Truvativ Noir crank. It was once a triple on the old Jet9 (my first mountain bike):

I’d converted it to a single ring and used it for a while on the One9, and it basically did fine as a singlespeed crank until Kenny and I discovered the removable spiders on most of SRAM’s new cranks.

this is where you need to start paying attention…

He bought an AKA Singlespeed crank (nice, aluminum replacement for their previous Stylo offering). It has a 104mm BCD removable spider. He took the spider off and ordered a spiderless ring from Homebrewed Components. This left Kenny with a spare SRAM 104mm BCD Spider.
Very cool, I thought. Then, I noticed the screaming deal on an X.0 2×10 crank through the SRAM employee purchase program. It has a proprietary 120mm BCD spider/chainring. I bought one with two intentions- 1)remove the chainrings/spider and have a spare for my geared bikes and 2)contact Homebrewed Components and get a spiderless chainring for the pimpass carbon X.0 crank. Homebrewed Components is a one-man operation that gets a lot of business, so orders tend to take a while. I don’t mind, but I am impatient.

Then, Kenny gave me his 104mm spider. This meant that I could use whatever singlespeed chainring I wanted while waiting for the spiderless ring to manifest itself. Turns out, the carbon X.0 crankarm is a lot fatter than an AKA crankarm. The “key” pattern of the spider was correct, but the shape of the rest of the spider prevented it from seating properly on the arm.

Enter the bench grinder.

I ground off a good deal of the spider, but was having trouble getting it totally flush on the crank arm. I went to Lowe’s for some Dremel grinders, and when I arrived back, Kenny had gone medieval on the spider with the bench grinder. ElevenĀ  grams of removed aluminum later, it fit. BAM!

 

While I was in the weight weenie mood, I went ahead & ground off the granny gear nubs on the backside of the spider:

 

 

Mounted to the crank:

 

Bling!

 

What did I achieve other than good looks? The total weight savings is about 50 grams over the Noir crank (plus a bit more when I get the spiderless ring). Not a ton, but the custom “badass” factor is reason enough to rock this one for a while.

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