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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 02-21-07, 11:20 PM   #1
Shiseiji
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Chainwheel on Tracer® Romax Crank

I am asking for advice on replacing my bent chainwheel. My '06 Montaque Hummer3 has a Tracer® Romax crank with a 42/34/24T chainwheel. I think the chainwheel has been bent since day one, but it took me till now to put a dial indicator on it. Run-out is a total of .04", from +.0185" to -.0125 in a run of about 2" across the crankarm on the 42T to .030" on the 34T and .08" on the 24T. I believe these are 170 mm crankarms.

A friend advised I pull the chainwheel and use a vice to avoid lateral pressure on the crankset. It looks to me like the chainwheel is riveted (pinned??) to the crankarm not screwed like my '88 High Serra. So should I just get a new crank/chainwheel? If so, should I go for matching the teeth or just a decent price? I often have to climb a 1,000' 20% grade in 24/32 or 19.5 gear inches, but as the road is closed, I do 50' or so switchbacks. The rest of the time I mostly ride 34/11 or 80.4 gear inches to avoid the extream ends of the range though riding 24/11 generally an issue as far as my stamina.

As always,

TIA

Ron
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Old 02-22-07, 02:44 AM   #2
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the components on the montague/hummer are of extremely poor quality . I would just use a crecent wrench and bend the offending chainring out to where shifting quality is tolerable.
Otherwise take it to your LBS and ask for a cheap mountain crankset. Alivio or Deore, both are significant upgrades, but again, the rest of the components won't be up to par.
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Old 02-22-07, 07:55 AM   #3
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unless it's causing problems, leave well enough alone.
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Old 02-22-07, 06:10 PM   #4
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My reply has bombed 3X... anyway, thanks all. Why am I not surprised on the quality? I wondered when I couldn't find anything on the crank set. After reading the first reply, I decided to call Montaque to see if they would cut me a deal on a crank set. It is causing problems as the spread is big enough I can't get the index set. So I called Montaque, was very polite, went through the history, how little I have been able to ride the bike, my troubleshooting with the dial-indicator, mentioned I was unhappy with the quality when I found I couldn't remove the chainwheel. rivets faked to look like screw heads etc. They were pretty insistent I take it to a LBS, but I mentioned how I had purchased the dial indicator and buying a crank tool is not an issue. Paying the LBS $150+ ? is an issue. Played my "divorced Dad, 3 kids" card (all true) and how as an aircraft mechanic I just want to know what size the crank set is 'cause I am not spending money on something I can do myself, especially given how much I paid for the bike, less then 20 miles on it etc. When he asked where I had got the bike it came out I am in the Army. So, he is checking to see about a crankset to give me a "deal" on. Will see what happens next.

Thanks again, am open to suggestions on what brand crank tool to get.

Ron
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Old 02-23-07, 01:38 AM   #5
Bill Kapaun
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If they send you a free one, hopefully it's not worse
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Old 02-23-07, 01:57 PM   #6
Shiseiji
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Yea Bill, my thought too. I have been doing some pricing, seems like I can get at least the next (minor) level up for < $90. I am 6'1" so wondering if I should try a set of 175mm. I am pretty ignorant (but ignorance is repairable, stupidity can be tough) so need to make sure I get the right parts. I am back to my orginal question to Montaque: What size is the Bottom Bracket? Are they generic for my purposes?

I have found a Shimano Deore FC-M530 Crankset 48x36x26 for a Octalink V2 BB and a
Shimano FC-M470 Crankset 44x32x22 Spline with no mention of what BB it goes on. Does that mean it is a British/I.S.O. ?

Ron

Last edited by Shiseiji; 02-23-07 at 02:39 PM.
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