150mm Crank arms

Hi All,

Have converted my Pug with 170mm cranks, they are ugly cheap ones that look horrible, now looking to put something a bit nicer on them.

The pedal clearance is awful at the moment so am toying with the idea of getting 150mm cranks, anyone know where to source these, ideally in white or silver?

Also any other suggestions on how to increase pedal clearance is greatly appreciated.

Thanks

Kids bikes got them, weight a ton ,
BMX surely, weight a BMW .

Huh?

SJS cycles may be worth a try. You should in theory be able to use a lower gearing and spin more (easier with shorter cranks) for same speed.

I have two unused silver 155 cranksets, Miche Young or origin-8. You can have either for £10 collected from Seven Sisters or St Paul's. The Miche Young is a full chainset (a double, but you could run with one chainring), the origin-8 is just the cranks.

http://www.wiggle.co.uk/miche-young-chainset/
http://www.roadbikeoutlet.com/origin8-165mm-crankset-gunmetal-grey-with-silver-46t-chainring.html

You have PM

Huh?

I'll elaborate then :

kid's bike have got short cranks, and normal spacing for hubs at the rear,
so good clearence for the chanstay, they are steel hence heavy .

Bmx/v cranks are heavy, short, lots of designs available,
a friend used them on his kid's bike,I suspect he used adaptors .

Huh?

I'll elaborate then :)

kid's bike have got short cranks, and normal spacing for hubs at the rear,
so good clearence for the chanstay, they are steel hence heavy .

Bmx/v cranks are heavy, short, lots of designs available,
a friend used them on his kid's bike,I suspect he used adaptors .

You don't want 150mm cranks.

What pedal clearance are you talking about, pedal overlap or pedalstrike on the ground?

SJS sell 140s - they're cheap, basic, and heavyish, though I haven't weighed them and they may actually not be so bad compared to to 170s. They're a small fixed chainring, how many teeth eludes me. Gearing wise they're pretty similar to a normal sized chainring with normal length cranks but obviously ymmv.

I've done maybe a couple of hundred miles on them and am happy. Takes oooh, 15 minutes to get used to them and then you're fine. Don't believe the silly bollocks people say about losing leverage - it's just the same as changing any other part of your transmission. Compensate with a smaller chainring or larger sprocket and the only difference is that you're doing a higher cadence. It's not nearly as noticeable as you'd think, because your feet are doing smaller circles. I can go just as fast with mega short cranks as with normal length ones, with a smaller chainring to give the same gearing.

I got them for the stupidest reason imaginable (got wound up with metal toe clips dragging on the floor on the pedestrianised parts of Oxford). There are other claimed benefits but they're slightly fringe and I didn't have knee pain before so cannot make miraculous anecdotal claims.

Sheldon Brown has a gear calculator that takes into account crank length, btw.

(re. the SJS ones, I have no idea what chainline they are since I have an adjustable BB)

Pedal strike clearance is the main issue!!

Ben - thanks for the advice, that has sold it to me, going to pick up a pair off brokenbetty and give them a whirl!

Will report back and let you know what the conclusion is!