Sugino crank thread - RD, Comp, 75, Super Mighty cranks

I was told by Greg at London FIelds Cycles ( one of the best mechanics in london) that, i must pay attention to those things as in the past 10 months he had about 6 or so coming into his workshop....after snapping!!!!!
SO he said to pay extra attention at the arms as they are bound to crack in between a year or 2 of usage.

sugino comp they're not the 75's are they ?

no, look similar but are miles apart on quality
I was reccomended to get shimano cranks or just go for the 75
Shimano £40, never seen one brake
Sugino 75 nice but pricey.
These 2 are my only option as i would only use black cranks

what about fsa ones? they come in black too

at £274

How can you tell which are the Comps? I have suginos on my Flyer. What are the markings to look out for?

I had some sugino cranks on my mountain bike a while back. I snapped them too, right in the middle of traffic, didnt fall off, but wasn't very dignified either.

They will not be 75's on the Flyer.

The flyer's stats helpful state that they're 'Sugino track' cranks which is meaningless. They're definitely not 75s.

75s look like this. BCD is 144mm

RDs a bit like this. BCD is 130mm.

Comps cranks, I believe are just the RD cranks with a cheaper ring made in bulk for the Langster, Flyer etc. Look at the stamping inside, should give some indication. But I have nothing definite to back this up.

Sugino's website doesn't list Comp as a model, which makes me think they're just rebranded RDs. However they could be made with the same tooling but using cheaper materials. Anyone know?
http://www.suginoltd.co.jp

I have the RDs, which do seem to flex quite a bit

http://www.bikesportmichigan.com/reviews/crank.shtml

I had a set of RDs - then hit the lhs one on the kerb and rounded out the spindle. Looking for a replacement I found that they're a road crank rebadged for fixed use, and also come anodized black and called 'messenger RD' and also come rebadged by On-One.

Nobody had any in stock so I bought a set of Miche Pista so that I could get back on the bike sooner. They're immensely better.

edited to add - which is mainly down to the fact that, combined with Miche BB, they make for a much better aligned drivetrain and they've never worked loose, nor has the bb cup unthreaded itself. simple things from a better thought through design i think.

I know they´re not 75s on the Flyer. I remember from looking lastnight, that RD was stamped on the back, and they did look pretty roughly finished in the hidden areas. Hhhmmmmmmm........

I've heard a few cases of the Sugino RD (?) as supplied on the Langster's snapping after a while - always the left crank. They are double chainring cranks, with one steel chainring, they were on my 2006 Langster. The machining/casting leaves a lot to be desired.

Does that echo what the shop mechanic, Greg, reports?

I sold my set on Ebay, replaced them with NJS Sugino 75's, these are immeasurably better - rigidity, machining, 144 BCD etc ...

In the past I have also used the latest Dura Ace (Octalink type, until that bike was nicked from Poland Street) I also highly recommend these.

Had a bit of experience with the Campag C Record track cranks, also awesome! I'd personally steer clear of the old school design Campy fluted 60's/70's cranks, they suffer from fatigue cracks and breakages ... that's why you see so many left or right only cranks on Ebay, as opposed to pairs :)

was looking at buying some sugino 75 cranks can someone tell me what size should one buy

I'd go for large - even if you're hungry you can never finish a super size.

What do you mean by size? 165 or 170 (crank length)? chainring size? BB spindle length?

?

%

height of your BB and leg length are the key variables I think

also your breast cup size.

This may help.

robbojnr was looking at buying some sugino 75 cranks can someone tell me what size should one buy

I will guess that this is for a fixed gear bike (?) - then 165mm might be a good choice as you cannot level your cranks when you corner (the drivetrain will keep the cranks rotating) so 165mm might help you keep the cranks (pedals/shoes) from making contact with the ground.

But that is just a very wild guess as you have not told us what you are planning to do with these cranks.

As hippy's site says "Not all tablespoons are the same." We need to know whether your baking this cake in Australia, Canada or the UK before we can really help you, robbonjr :)

(If you're referring to 165 or 170, which I'm guessing you are, i'd go for 165 if it's going on a conversion, due to the lower BB height on road specific frames. 165 will make your crank's turning circle a centimetre smaller, which means less leverage which means it's relatively harder to turn the same gear with 165 vs 170. I didn't think i'd be able to tell the difference, but i definitely can. For me the gear ratio 46x17 feels heavier than 48x17 because of the 165-170 difference. I guess it could've been another factor though)

165 will also help with top overlap.

Top overlap is shit, I measure all of my tshirts/sweaters to make sure they don't overlap my belt at all.

wheels [quote]robbojnr was looking at buying some sugino 75 cranks can someone tell me what size should one buy

I will guess that this is for a fixed gear bike (?) - then 165mm might be a good choice as you cannot level your cranks when you corner (the drivetrain will keep the cranks rotating) so 165mm might help you keep the cranks (pedals/shoes) from making contact with the ground.

But that is just a very wild guess as you have not told us what you are planning to do with these cranks.[/quote]

im planning in using them for a new belt buckle what you think..what color the belt is orange