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  1. #1
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    Sugino XD600 or Shimano FC-M590 cranks for my 8 speed drive line?

    I am looking for a set of triple ring cranks that are compatible with my 24 speed (8 gear cassette) hybrid bike. This bike came with 48-38-28 tooth Shimano FC-M36108 cranks and an SRAM 11-32 rear cassette.

    There are a few reasons why I want to replace these M361 cranks with another set: 1) The Q-factor or width of these cranks is about a ½” greater then my old M760 XT’s on my mountain bike, which for some reason puts a lot of strain on my inside left knee and 2) It is very hard to climb a steep grade with the 28 tooth small chain ring and the 32 tooth gear on the cassette (24.17 gear inches or a 1.75 gain ratio with 175mm crank arms).

    Both the Sugino XD600 (46-36-26T) and FC-M590 (48-36-26T) crank sets both have smaller Q-factors and 26 tooth chain rings, which would give me a little bit of a lower gear ratio of 22.45 gear inches or 1.625 gain ratio. The Sugino has a smaller Q-factor, stiffer 5-bolt chain ring pattern but relies on a square taper BB compared to the outboard BB Deore crank set. Which cranks are more durable and work better with an 8 speed drive train the XD600’s or the FC-M590’s?

  2. #2
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    The XD600's are a workhorse crankset that is very popular with the touring crowd. The advantage of the square taper BB is bearing longevity, less bearing resistance, and lower Q-factor. The one main disadvantage is stiffness...but since most tourers remain seated and spinning...it's not really a factor.

    Depending on your chainstays, you'll need either a 113mm or a 118mm BB, get a quality model like Shimano UN54 or IRD Quad.

  3. #3
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    My other option is to buy (3) chain rings for my 2007 Truvativ Stylo GXP crank set. The three rings (46, 36 and 26) would retail for well over $100.00 unless I could find 8 speed compatible steel rings with shift ramps that fit the Stylo’s 104/64mm 4-bolt pattern and spider.

    Jenson USA has a 48-36-26 Truvativ FireX GXP crank set for $120.00, a 48-38-28 Sugino Impel 150X Triple crank set for $43.00 (the 28 gear is a little too tall for my current fitness level on steep hills) and a 46-36-26 Sugino XD600 for $105.00. Both Sugino’s would need a $20.00 UN-54 BB. I assume that a 113mm long spindle would yield a 47.5 mm CL and a 118mm BB spindle would position both Sugino crank sets to a 50 mm CL.

    I have a few concerns with the Shimano square tapered UN-54 BB: 1) The non-drive plastic retaining cup cracking and 2) the lack of CL adjustability.

  4. #4
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    Quote Originally Posted by bwalton
    My other option is to buy (3) chain rings for my 2007 Truvativ Stylo GXP crank set. The three rings (46, 36 and 26) would retail for well over $100.00 unless I could find 8 speed compatible steel rings with shift ramps that fit the Stylo’s 104/64mm 4-bolt pattern and spider.

    Jenson USA has a 48-36-26 Truvativ FireX GXP crank set for $120.00, a 48-38-28 Sugino Impel 150X Triple crank set for $43.00 (the 28 gear is a little too tall for my current fitness level on steep hills) and a 46-36-26 Sugino XD600 for $105.00. Both Sugino’s would need a $20.00 UN-54 BB. I assume that a 113mm long spindle would yield a 47.5 mm CL and a 118mm BB spindle would position both Sugino crank sets to a 50 mm CL.

    I have a few concerns with the Shimano square tapered UN-54 BB: 1) The non-drive plastic retaining cup cracking and 2) the lack of CL adjustability.
    Well you can use a 9 speed crank with 8 speed, but I recommend also using a 9 speed chain as you can get some chain rub on the inside of the outer ring when in the middle ring and in the 7 and 8 cogs in the back. 9 speed chains work fine on 8 speed cassettes. I use the FireX GXP on my 29er and it is a good crankset, though you will not get the lifespan from the external BB as you get with an internal square taper. Plus, the FireX feels WIDE...not sure of the Q-Factor but it feels wider than any crankset I've ever owned. You don't want the Impel 150X as the rings are riveted and not replaceable. You are correct on the chainline figures...if using on a road bike you can usually go down to 110mm (for 45mm chainline) or even 107mm (42.5mm chainline).

    Now, addressing your concerns on the UN54
    1) If torqued to spec, it will not crack...however if your really concerned you can either get an alloy cup from Problem Solvers for $20 (or check your LBS and see if they have any UN72 cups laying around...or better yet complete UN72 bottom brackets) or go with the IRD Bottom Brackets.

    2) You can buy 4 or 5 UN54 bottom brackets before you would pay for one adjustable CL square taper these days...so figuring the safest bet is 47.5mm, at worst you might buy two.

  5. #5
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    I am currently running a 44-32-22T 2007 Truvativ Stylo GXP crank set on my 8 speed hybrid. I replaced the middle OEM 32 tooth chain ring with a 36 tooth Salsa ring, which works well on my flat commute to work and back. I always keep the chain on the middle 36 tooth chain-ring and shift down to my 32 tooth cassette gear when I start up from a stop and to the 5th cassette gear when traveling in the park. This bike is loaded up with about 10 pounds of clothes, tools, lunch and etc. on its back rack when it is used for commuting. The 8 speed rear cassette is an 11-32T SRAM PC-830.

    Anyway the reason I want to replace the cranks or chain-rings is because I signed up for the 65 mile Wild Flower bike tour at the end of April. And this weekend, after I reinstalled the OEM 48-38-28 Shimano FC-M36108 cranks back on my hybrid, I quickly learned the 28T ring and 32T cassette gear is a little too tall for me on steep grades. I climbed approximately 1200 feet in six miles without stopping, which really wore me out for the other 20 miles I had to complete to get back home. However, the 48T ring works really well when pedaling down hills. Ideally, the best combination for my current fitness level would be a 26T chain-ring and a 34 tooth cassette gear for climbing steep hills and a 48T x 16T+/- for down hill runs. Unfortunately I would need to switch over to a 9 speed drive train in order to get an 11-34T cassette. So I am hoping my fitness level will improve enough in the next month to make the 8 speed 26T x 32T hill climbing granny gear comfortable. So for approximately $130.00 I can purchase a 46-36-26 Sugino XD600 crank set with a BB or spend well over $300.00 for a complete 9 speed drive train (i.e. purchase a crank set, shifters, cassette, front derailleur, rear derailleur and a chain).

  6. #6
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    Shimano does make a 11-34 8 speed cassette, but it is a BIG jump from the 2nd gear to 1st gear.

    http://www.universalcycles.com/shopp...11&category=42

  7. #7
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    SRAM PG 830 11-32T cassette gearing 11-12-14-16-18-21-26-32
    Shimano HG-40 11-32T cassette gearing 11-14-16-18-21-24-28-32
    Shimano HG-40 11-34T cassette gearing 11-13-15-17-20-23-26-34

    A 28T chain-ring x 32T gear with a 700 x 38c (27 5/8” O.D.) tire yields 24.17 gear inches (my current granny gear setup).

    A 26T chain-ring x 32T gear with a 700 x 38c tire equals 22.44 gear inches.

    A 28T chin-ring x 34T gear with a 700 x 38c tire yields 22.75 gear inches.

    A 26T chain-ring x 34T gear with a 700 x 38c tire equals 21.125 gear inches.

    Does 2 to 4 more gear teeth really make that much of a difference when climbing a steep hill?

  8. #8
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    For what it's worth (probably nothing), I've been riding SS and geared on 2 sets of Sugino XD300's for several years. I never noticed any flex. They have far outperformed their initial price point.

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