Weight Weenies

Hi.
I'm building a dedicated hill climb bike for Mt. Washington where the time penalty is about 30 seconds per pound.

I'm going to run either a single 20 or 22T chain ring which requires 64mm BCD. Obviously shift quality and bearing durability are not issues. loose or broken cranks would be.

Frame will be a PF-30

The Extralite e-bones W (479 grams advertised) look pretty good to me.

Any experience as far as quality?

Any better alternatives?

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They are not extralite's finest work. The company builds good gear but the e-bones are quite an old design. See madcow's review on cranks...it is VERY comprehensive.

no

theremery wrote:They are not extralite's finest work. The company builds good gear but the e-bones are quite an old design. See madcow's review on cranks...it is VERY comprehensive.

Tried the search but can't seem to find the review. Could you link me please

The MTB E Bones have a Qfactor more than 20mm wider than the road version. Is that an issue for you? Other than that, nothing to worry about.

Have you thought about Lightning or Specialized road cranks and using a Lightning 104/64 spider?

jooo wrote:The MTB E Bones have a Qfactor more than 20mm wider than the road version. Is that an issue for you? Other than that, nothing to worry about.

Have you thought about Lightning or Specialized road cranks and using a Lightning 104/64 spider?

I hadn't- traditionally I just use Shimano stuff for my road and mountain bikes- but I'm inspired to build a ~10 pound bike for this ride.
Q factor isn't an issue- I use MTB triples on everything pretty much.

I'll look into those- thanks for the reference.

Necessary research:
viewtopic.php?f=3&t=76357

prendrefeu wrote:Necessary research:
viewtopic.php?f=3&t=76357" onclick="window.open(this.href);return false;

Thanks!

I have the road version and can't fault them. Madcow's test doesn't seem too critical of them to me - they are among the lightest in the test, and while the stiffness to weight ratio doesn't seem very impressive I don't notice any flex in mine.

bobqzzi wrote:I'm building a dedicated hill climb bike for Mt. Washington where the time penalty is about 30 seconds per pound.

Thought about fixed gear?

Hollowgram SiSL with a one-piece chainring?

WMW wrote:

bobqzzi wrote:I'm building a dedicated hill climb bike for Mt. Washington where the time penalty is about 30 seconds per pound.

Thought about fixed gear?

Yes, but rejected it immediately- the grade varies enough (8% to 22%) to require different gears. Any time gained from weight reduction ( 1 rear cog and no brakes, rear derailer) you (or at least I) more than give back with less than optimal gears at certain spots.

I'm going to run the 4 top cogs from a 9 speed XTR cassette (34/30/26/23) which shoudl give me the proper range of speeds with a 20 or 22T front.

Good thought though

cerro wrote:Hollowgram SiSL with a one-piece chainring?

I assume that I would have to have such a chainring custom made or is there one currently produced?

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They're available via HomeBrewed Components (or Fibrelyte, but contact them)

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