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Upgrade from Shimano m151 Crank?

Old 04-07-10, 10:20 AM
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Question Upgrade from Shimano m151 Crank?

I'm in the process of upgrading some of the weaker components on my Cannondale Quick 6 and it looks like the crank they used is a pretty cheap Shimano crank. I am wondering what kind of upgrades are available to the Shimano m151. The current crank I have is a square taper, 122mm bottom bracket, 28/38/48 crank. It looks like the easiest upgrade would be to get a Shimano m191, but it's also very cheap (cost wise), which leads me to believe that there isn't much of an upgrade there. What do you guys recommend? FYI I'm using Shimano 8 speed bar end shifters with a Shimano HG-70 cassette in friction mode.

Old Crank:


Suggested Upgrade:


Any help is appreciated!
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Old 04-07-10, 10:25 AM
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What are you looking for out of a new crank? A change in gearing? A lighter crank?

That M151 is fine and should last many thousands of miles without trouble. Any particular reason you don't want it?

We can't offer good alternatives until you let us know why you don't like your existing one.
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Old 04-07-10, 10:29 AM
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The main reason I'm looking to change it out is because it doesn't shift through each gearset that smoothly and I think that I could find something modestly priced that will be stronger and somewhat lighter (although I'm not a weight weenie). Something a little better looking would be nice too, but that's not really a factor in this decision (I can't really see my crank when I'm riding, anyways).
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Old 04-07-10, 11:33 AM
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A new front derailleur and having it properly adjusted would help more for shifting than a new crankset...

If you want a new crankset, something like the Sugino XD600 would be hot. Really, just about any crankset will do.

Keep in mind, you'll need a new bottom bracket, unless you can find another square taper spec'd out to 122mm. That's not a common spindle length. That M191 should work, but its not really much of an upgrade over the 151.
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Old 04-08-10, 10:49 AM
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Thanks for the tips! That Sugino looks pretty sweet and seems like a worthwhile upgrade, but I'll have to save up for that and the bottom bracket and tools to do the job (it would probably be cheaper to have the bike shop do it). I think it would be a good upgrade down the road though. Appreciate the advice
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Old 04-13-10, 08:36 AM
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So I went ahead and ordered up the Sugino XD600 in a 175mm crank arm length and a new Shimano bottom bracket. I'll throw up some pics when it's done, but I'm really stoked. Thanks again for the recommendation.
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Old 04-13-10, 08:30 PM
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I went from a m191 to the XD600. Primary noticeable difference was the less noobish appearance. Secondary noticeable difference was a quieter chain ring/chain interface. Those were the two things that bothered me and the fix was thus a success.
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Old 04-14-10, 08:12 AM
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I thought it was impossible to use those two words together !!!! Shimano, Cheap !
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Old 04-14-10, 08:22 AM
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I would have thought so too, but apparently the crank that I have is about $15 brand new (vs. $105 for the Sugino I ordered). I also ordered a nice Shimano bottom bracket, some new Shimano clipless pedals, and some size 49 shoes to seal the deal. Too bad there are supposed to be serious thunderstorms here for the next few days
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Old 04-22-10, 02:48 PM
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Here's the final result! I'm really happy with it and the bottom bracket upgrade was nice as well. Thanks again for the recommendation


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Old 04-23-10, 06:40 AM
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Did you mount it yourself or a bike shop?

Installing isn't bad, but it can be slow the first time and you do need tools.

Did you keep the same gears or change up sizes?

I recommend that riders at least buy a basic cheapo tool kit and make an attempt to wrench their own bike.

If you become comfy working on your own bikes, you can handle minor issue when out riding quicker and you can tune your bike whenever you like rather than having to swing by a shop.

Your Suginos looks much better. Are they still square taper?

I had an amazingly junky crankset on my 7300fx. Most mid to low priced hybrids come with bottom barrel cranksets. They are serviceable for light riding, but flexing crank arms and PITA plastic chainguards don't do it for me.

Even for less than $60, you can find a reasonably solid crankset and BB. Sometimes gently used. On occasion, even new. (I got brand new Shimano 105 cranks for $32 shipped once).

Shimano has always had a line of bottom end junk. You may want to be careful whenever a component JUST says 'Shimano' on it and nothing else (no Deore, 105, etc.). Often times that means bottom barrel, Wal-Mart $100 bicycle junk. It's good marketing for the chains to list 'Shimano Components' because people get fooled into thinking its good stuff.

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Old 04-23-10, 06:51 AM
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I was going to originally mount it myself, but the bike shop charged me half the cost of the tools to do it myself, so I figured I'd let the professionals do it. I definitely wanted to give it a shot but I couldn't justify buying a crank puller and bottom bracket socket for the time being. Definitely in the future, though.

In terms of gearing I went from a 28/38/48 to a 26/36/46. Not a huge difference in that regard, but this new crank is WAY lighter than the old one, which is noticeable.

I was originally going to buy a tool kit, but I think I'm going to just buy the Park Tools I need one at a time as jobs come up on the bike. For now I have a large Craftsman toolset that has a bunch of good open ended wrenches and allen keys.

The Suginos definitely look awesome! They are still a square taper. From what I was told it is way up there in terms of square taper cranks, so I'm really happy with the choice. I knew originally that when I bought a budget Cannondale they were going to cut corners somewhere. I had no idea, though, that the crank would be so cheap. The main thing I hated was how heavy it was and the cheap plastic cover.

I was actually pretty shocked at the deals you can get on a much improved crank, or even cassette. I'm working on a few more drivetrain upgrades, including a new set of wheels, but I'll have to save up for that.

Thanks for the positive feedback
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Old 04-23-10, 03:35 PM
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Nice upgrade, I like it...

Wheels, eh? How about...



Originally Posted by ATX 6Speed View Post
Here's the final result! I'm really happy with it and the bottom bracket upgrade was nice as well. Thanks again for the recommendation


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Old 04-23-10, 03:37 PM
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I was definitely thinking of getting some Mavics next. Are those Gatorskins I see...
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Old 04-23-10, 05:20 PM
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No, they are travel contacts... good for crushed limestone!



Mikey

Originally Posted by ATX 6Speed View Post
I was definitely thinking of getting some Mavics next. Are those Gatorskins I see...
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Old 04-23-10, 05:51 PM
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Oh nice! I'm probably going to get some Continental Gatorskins in the next few days. I just gotta shop around for a good deal.
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