Advertise on Bikeforums.net



User Tag List

Results 1 to 19 of 19
  1. #1
    Young and unconcerned Treefox's Avatar
    Join Date
    Apr 2006
    Location
    Merry Land
    My Bikes
    Yeah, I got a few.
    Posts
    4,131
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Tiagra derailleur cheaper than chain... Odd...

    I've been looking around at options for upgrading/repairing my old skool down-tube shifting RX-100 groupset, and a Tiagra setup (keeping the RX-100 front derailleur + brakes and the 105 chainrings I've got) seems to be a logical thing to do based on my meagre grad-student budget (and even this project may be a way off yet).

    But the really curious thing is that the Tiagra RD, for which the best price I can find is 16.99, is cheaper than an appropriate chain - usually in the 20 range for something half-decent. Yeah, I know the STI levers do most of the work, and that work would run me 104.99 for the pair, but still; it's odd that something so fancy-looking as a derailleur would cost less than something so seemingly basic as a chain.

    I'd need a new rear wheel as well, of course, as the current freewheel is a 7-speed, but that's sort of the point; the cones are all pitted and it's a vain quest to keep the thing true - - and I'd never find a decent 7-speed road wheel, so to get a new wheel I pretty much have to take it all up to 9-speed.

  2. #2
    Senior Member
    Join Date
    Feb 2005
    Location
    Oklahoma
    My Bikes
    Trek 5500, Colnago C-50
    Posts
    9,119
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    I think the RX100 quality-wise was probably between Tiagra and 105. For a rear derailleur I'd rather have the 105. With chains I think you generally get what you pay for. I understand the importance of sticking to your graduate school budget.

    Al

  3. #3
    Senior Member
    Join Date
    Jun 2006
    Posts
    159
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    From what I have heard, RX-100 was really relabeled 105.

  4. #4
    bike rider jimmythefly's Avatar
    Join Date
    Feb 2005
    Location
    Seattle
    My Bikes
    83 Trek 500, 2x 90s Novara Randonee, Zion 737, Specialized Rockhopper, Nishiki Colorado, Univega Specialissima
    Posts
    282
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Even better, just use your old derailleur. It will work fine with newer shifters. Just a reminder, you'll also want to get cable stops that mount where your shifters used to be, plus new cables, a couple of ferrules, housing, bar tape, etc.

    Not sure why a chain is more expensive than a RD. Maybe chains require tighter tolerances, better materials, or more manufacturing steps? As I've stood up to power across an intersection I often marvel that the thin little chain can take the multiplied torque I produce. And I'm really not that powerful -can't imagine what a pro sprinter puts out.

  5. #5
    Senior Member
    Join Date
    Dec 2005
    Location
    Charlottesville, Virginia
    My Bikes
    Dawes Kalahari, Puch Prima Super Sport, Graham Weigh 853
    Posts
    1,990
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    quote - I'd need a new rear wheel as well, of course, as the current freewheel is a 7-speed, but that's sort of the point; the cones are all pitted and it's a vain quest to keep the thing true - - and I'd never find a decent 7-speed road wheel, so to get a new wheel I pretty much have to take it all up to 9-speed.[/QUOTE]

    why not buy some sora sti levers? they are available in 7 speed. You may find that you cannot fit a 9 speed rear wheel, as it may be too wide for your frames (rear spacing). The Tiagra/Sora shifters should work well with your existing derailleur.
    Also, not that you can fit 8 and 7 speed cassettes on to a 9 speed wheel. You have to use a spacer for the 7 speed, but it works very well. Btw, for the price of the upgrade you mention, you could easily get a Campagnolo Xenon GROUP! Cheap wheelset (eg Vuelta) 60ukp. Xenon group 130 ukp = 190ukp to run 9 speed campagnolo, versus 110ukp for the Tiagra STI's alone....

  6. #6
    Senior Member Retro Grouch's Avatar
    Join Date
    Feb 2004
    Location
    St Peters, Missouri
    My Bikes
    Rans Enduro Sport, Hase Kettweisel Tandem, Merin Bear Valley beater bike
    Posts
    23,821
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by jimmythefly
    Not sure why a chain is more expensive than a RD.
    I'm not sure either but I read someplace that, if you completely disassembled everything, the chain would account for half the parts of the entire bicycle.

  7. #7
    Senior Member
    Join Date
    Jul 2004
    Location
    N Dallas, TX
    Posts
    830
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    you could save some $ on the shifters by going with bar ends.

  8. #8
    Young and unconcerned Treefox's Avatar
    Join Date
    Apr 2006
    Location
    Merry Land
    My Bikes
    Yeah, I got a few.
    Posts
    4,131
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by acorn_user
    Btw, for the price of the upgrade you mention, you could easily get a Campagnolo Xenon GROUP! Cheap wheelset (eg Vuelta) 60ukp. Xenon group 130 ukp = 190ukp to run 9 speed campagnolo, versus 110ukp for the Tiagra STI's alone....
    True... Though would a Xenon set be necessarily that much better than 15-year-old RX-100? And With Xenon levers I assume I'd have to go with Campy derailleurs - I'd more likely to for Sora levers and keep the existing derailleurs. But I don't like the thumb clicky things for shifting, so that's why I've been looking at Tiagra.

  9. #9
    Senior Member
    Join Date
    Dec 2005
    Location
    Charlottesville, Virginia
    My Bikes
    Dawes Kalahari, Puch Prima Super Sport, Graham Weigh 853
    Posts
    1,990
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Ribble are selling off the Ultegra level 8 speed levers for about the same price as sora sti's. That would be a great option. 8 speed chains and cassettes are reckoned to be more durable than 9, and they are cheaper to boot.
    The Xenon group option at 130ukp would include the derailleurs. You are right in thinking that things would work better with the campagnolo mechs.
    To be honest, i doubt that tiagra would be much better than 15 year old rx-100 if it is in good nick. The biggest shifting improvement would probably come from some snazzy cables, well set up. I quite like the sora thumb shifters, but those of campagnolo levers are better placed. I find them tricky to use from the drops, but I don't ride there much. For me, it is worth it to have solid brake levers (which is why the bike i am riding right now has shimano downtube levers and exage brake levers).
    dave

  10. #10
    Senior Member Ziemas's Avatar
    Join Date
    Nov 2004
    Location
    Riga, Latvia
    Posts
    10,070
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Check out http://www.bike-components.de/ I've had very good luck with them. They have the least expensive parts I've been able to find in Europe.

  11. #11
    Senior Member
    Join Date
    Sep 2004
    Location
    New Jersey, USA
    Posts
    1,007
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Are you sure you can't find a chain for less than 20 UKP? If you don't have a 10 spd. setup, you can find chains which are pretty cheap. I have an older 7 speed bike and bought an SRAM PC-58 here in the states for around $15 (at an online discounter). KMC also makes some pretty inexpensive chains that are of good quality.

  12. #12
    Young and unconcerned Treefox's Avatar
    Join Date
    Apr 2006
    Location
    Merry Land
    My Bikes
    Yeah, I got a few.
    Posts
    4,131
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    What sort of width in the frame would I need to make sure an 8/9 speed wheel would fit??

  13. #13
    Senior Member
    Join Date
    Feb 2005
    Location
    Oklahoma
    My Bikes
    Trek 5500, Colnago C-50
    Posts
    9,119
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Treefox
    What sort of width in the frame would I need to make sure an 8/9 speed wheel would fit??
    8, 9, and 10-speed road frames have 130mm dropout spacing.

  14. #14
    cyclist/gearhead/cycli... moxfyre's Avatar
    Join Date
    Oct 2004
    Location
    DC / Maryland suburbs
    My Bikes
    Homebuilt tourer/commuter, modified-beyond-recognition 1990 Trek 1100, reasonably stock 2002-ish Gary Fisher Hoo Koo E Koo
    Posts
    4,172
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Treefox
    What sort of width in the frame would I need to make sure an 8/9 speed wheel would fit??
    130mm, as already pointed out. If you have a 126 mm steel frame, you can spread it safely or have a shop do this (that means you permanently bend it out to 130 mm). If you have an aluminum frame, it isn't safe to permanently deform the frame, but many people have good luck with squeezing the dropouts open a little bit to fit in a wider wheel.

    I've been doing that for 1 year+ on my 1990 Trek 1100 aluminum frame, and it works great. I was worried about this at first, so I asked about rec.bicycles.tech and it turns out there are dozens of people doing this with no issues, some with thousands of miles on it.
    My bikes | Linux and Python stuff | Photo gallery

    Sheldon Brown, I miss you. Thanks for the advice, ideas, humor, and infectious enthusiasm for everything bikes...

  15. #15
    Young and unconcerned Treefox's Avatar
    Join Date
    Apr 2006
    Location
    Merry Land
    My Bikes
    Yeah, I got a few.
    Posts
    4,131
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Yeah; it's a steel frame... scary though... what if it doesn't bend straight? I suppose 4mm isn't anything huge though.

    I'll have to go measure it.

    The question though: If I spend the money on a wheel, STI shifters, new cassette, and rear derailleur, it'd be probably half or two-thirds the price of a used but good condition Tiagra or 105-equipped bike... Hmmm.... things to ponder. And thanks to Acorn_user for the Ribble suggestion. Nice prices there. I could get a pair of Tiagra wheels for 50.

  16. #16
    cyclist/gearhead/cycli... moxfyre's Avatar
    Join Date
    Oct 2004
    Location
    DC / Maryland suburbs
    My Bikes
    Homebuilt tourer/commuter, modified-beyond-recognition 1990 Trek 1100, reasonably stock 2002-ish Gary Fisher Hoo Koo E Koo
    Posts
    4,172
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Treefox
    Yeah; it's a steel frame... scary though... what if it doesn't bend straight?
    If it doesn't bend quite straight, you bend it again to get it a little straighter That's the great thing about steel frames: they can be bent several mm without hardly weakening them.
    My bikes | Linux and Python stuff | Photo gallery

    Sheldon Brown, I miss you. Thanks for the advice, ideas, humor, and infectious enthusiasm for everything bikes...

  17. #17
    Young and unconcerned Treefox's Avatar
    Join Date
    Apr 2006
    Location
    Merry Land
    My Bikes
    Yeah, I got a few.
    Posts
    4,131
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Ah, good, well I measured it and it's 126, but out of curiosity pulled the rear wheel of a former housemate's semi-derilict Trek 1000, measured his, it's 130cm, and had a go putting his wheel on my bike. It really didn't take much effort to get the wheel to go on and it spun fine. So that's quite good news. I may pick up a pair of Tiagra wheels or see if I can track town a good price on just a rear Aksium wheel. Where can I find these spacers?

    Tragically I got dirty chain grease all over one of my fairly-nice shirts. Suggestions?

    I also noticed that my Reynolds531 steel Peugeot isn't really much heavier than the aluminium Trek 1000.

    How likely am I to be able to get the 7-speed cassette w/ spacer to line up just where the old wheel did such that I can swap the two back and forth at will (such that I could use the old wheel for commuting and the new one for proper rides)?
    Last edited by Treefox; 09-12-06 at 05:00 PM.

  18. #18
    Senior Member
    Join Date
    Dec 2005
    Location
    Charlottesville, Virginia
    My Bikes
    Dawes Kalahari, Puch Prima Super Sport, Graham Weigh 853
    Posts
    1,990
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    The best spacers are dead cogs out of old cassettes, because they are free.
    I went to a shop to do that to my new rear wheel last week, and they had used up all their cogs making decorations, so we used some bottom bracket spacers. Seems to work ok too, but without the Heath-Robinson element I liked.

    I don't know about the wheel-changey thing- remember 8 speeds onto an old 7 speed hub won't work too well unless you can hash it.

    Also, the Tiagra wheels are supercheap, but have you considered hand mades from Ribble, or Dave Hinde (both don't have great customer service reputations), or Chain Reaction cycles? A Sora hub with a Mavic MA3 rim would be cheap and stronger to boot! Also, M:Wheels do a pre-built version of the same; my experience of a similar wheel was great (until it was knicked)
    Dave

  19. #19
    cyclist/gearhead/cycli... moxfyre's Avatar
    Join Date
    Oct 2004
    Location
    DC / Maryland suburbs
    My Bikes
    Homebuilt tourer/commuter, modified-beyond-recognition 1990 Trek 1100, reasonably stock 2002-ish Gary Fisher Hoo Koo E Koo
    Posts
    4,172
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Treefox
    How likely am I to be able to get the 7-speed cassette w/ spacer to line up just where the old wheel did such that I can swap the two back and forth at will (such that I could use the old wheel for commuting and the new one for proper rides)?
    I'd say pretty likely, if you play around with different thin spacers and get it just right. I suspect, however, that you'll decide to use the new wheels all the time
    My bikes | Linux and Python stuff | Photo gallery

    Sheldon Brown, I miss you. Thanks for the advice, ideas, humor, and infectious enthusiasm for everything bikes...

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •