|should i upgrade to 9 speed?||rufus|
Aug 31, 2003 7:50 AM
|discovered a crack in my mavic ma40 rim yesterday, so i need a new rim. it's on my old 7 speed with downtube shifters. since the ma40 is a flat rim, and an open pro is semi aero, i'll probably need new spokes as well. so the cost of a new rim, spokes and a rebuild will probably approach the cost of a new already built 9 speed wheel.
so i might as well invest the extra cash for new dura ace downtube shifters(not brake lever shifters, cause i'm broke), cassette and chain. the old derailleur should cover the range with an adjustment to the limit screws.
yay, or nay?
|You can still get a mavic MA 40.||the bull|
Aug 31, 2003 9:13 AM
|I would just rebuild that wheel.
Try Nashbar or Licktons.
|already looked. no go||rufus|
Aug 31, 2003 9:21 AM
|the stock of ma 40's seems to be gone. even it's replacement, the ma3, has a higher profile and probably requires new spokes also.|
|Some new MA-40s on Ebay...||TFerguson|
Sep 5, 2003 7:04 AM
|re: should i upgrade to 9 speed?||Rusty Coggs|
Aug 31, 2003 12:02 PM
|If your 7 speed is cassette,then a wheel with shimano 8/9 hub and 4.5mm spacer. that asumes your old rig will handle 130mm dropout spacing of the new hubs.|
|what's the spacer for?||rufus|
Aug 31, 2003 12:51 PM
|i had thought about doing this last summer when my cogset needed replacing. it was an old uniglide that the last cog threaded on. i think you may have even offered your advice at that time. what i ended up doing was staying 7 speed, with a new hyperglide freehub and cassette.
but now, since a wheel rebuild will cost me roughly the same as a new 9 speed wheel, i can't see not sending just a bit more and going nine speed. i can get a 16 cog in the middle, and a lower climbing gear than my present 13-23. the shop had put a nine speed wheel on it last year while diagnosing the gear problems, and it fit right in, but i assume it was pushing the stays outwards somewhat. i measured the spacing and it's 126-127mm as close as i can measure it, but i'm planning on taking it to a shop who will cold set it to 130. and yes, it is a steel frame.
you seem to really know your mechanical stuff, so you think i should go the 9 speed route?
|what's the spacer for?||Rusty Coggs|
Aug 31, 2003 1:08 PM
|A 7 speed cassette is narrower overall than an 8 or 9 speed.The spacer goes on the hub 8/9 first and takes up the extra room. 9 speed with downtubes is cheap enough and it gives you a chance to change out stuff that could be worn anyway,besides the advantages you mention....As for 7 speed hubs,I saw an rx-100 at www.loosescrews that accepted either a uniglide or hyperglide cassette. I'd think there would be a rim still around that would be a close enough match to you old one.Try Sheldon Brown at www.harriscyclery.con.|
|actually, i emailed sheldon about spreading the frame||rufus|
Aug 31, 2003 1:43 PM
|and he said they could do it, so i'll probably go down there again. that's where i bought the stuff for last year's fix, and he was very helpful.
i wouldn't mind just putting a new rim on it, the hub's just fine. but the old ma 40 is a basic, box section rim, so it's very flat on top. the new ma 3, and open pros, are semi aero, or more rounded, with a higher profile. the ma 3 is about 2mm taller at the spoke eyelet, with the open pro about 4mm taller. so the shop says if i go with one of those i'll probably need shorter spokes too, instead of just swapping the rim over. so at this point, factoring in the cost of rebuilding it, we're talking enough money to almost get a whole new already built wheel. and if that's the case, it just seems to make sense to go to 9 speed.
except for that, nothing's really too worn on the drivetrain, as i got new cassette and chain just last summer, and don't put the miles on that some around here do. but like i said, i could use an extra couple of gears, and it just seems that if i have to spend $100 or so on the wheel, i might as well spend another $100 and convert to 9 speed.
|re: should i upgrade to 9 speed?||import silvia|
Aug 31, 2003 12:50 PM
|I have a Mavic MA40 with a 7 speed 105 hub sitting around. Let me know if you would be interested in it.|
|replace only the rim/spokes||Kerry Irons|
Aug 31, 2003 5:39 PM
|All the other stuff you're talking about is getting into real money. Unless this bike has EXTREME sentimental value, it's very hard to make the argument to invest a lot of money in a bike this old. You're better to find a cheap rim. Save the real bucks for the next bike.|| |