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Cheap road bike rear mech options

dannydcdannydc Posts: 14
edited November 2014 in Workshop
Hi all

I've just upgraded my awesome dawes giro 300 from the original Sora cranks to a Tiagra hollowtech 2 compact. The rear cassette (8spd) and chain are also new. Problem is I think it could do with a longer rear mech arm as it collapses on the smallest cogs - probably fixable if I swap out a chain link as there's a bit of slack at the other extreme. The handlebars are the old-school threaded type and the gear shifters are the old Sora type with the button and swing-arm brake levers like in the first photo here:
http://singletrackworld.com/forum/topic/sora-or-105

Seeing as I don't really like the existing shifters for braking because they swing inwards and I might need to change the rear mech, is it worth upgrading the shifters, rear mech and cassette in one go? I know the mech and casette are cheap but the shifters not so much, so I'm trying to work out what the best way forward is.

I was looking at the Tiagra 4600 Double for £100 but was hoping to spot a pair on ebay for less! Also, would I have to change the existing front derailleur mech if I changed the shifters?

ta
Danny

Posts

  • arlowoodarlowood Posts: 2,376
    dannydc wrote:
    I know the mech and casette are cheap but the shifters not so much, so I'm trying to work out what the best way forward is.

    Also, would I have to change the existing front derailleur mech if I changed the shifters?

    ta
    Danny

    No your front mech will be fine as long as you buy a set of shifters designed for a double front chainring.

    My advice would be to upgrade to 10-speed. New front mechs and casettes are cheap as you say and you can mix and match between Sora/Tiagra/105 and Ultegra. Keep a close watch on the classified section on this forum for your 10-speed shifters. Recent offer had some 105 5700 shifters on offer at £50 with some slight cosmetic faults but otherwise working perfectly.

    viewtopic.php?f=40091&t=12996380
  • StillGoingStillGoing Posts: 5,152
    Go to eBay. I recently sold a full Tiagra groupset in excellent condition for £100 that was taken off an old frameset.
    I ride a bike. Doesn't make me green or a tree hugger. I drive a car too.
  • MatthewfalleMatthewfalle Posts: 17,571
    Or chuck me some wedge for some unused Rival carbon shifters and cables I have in the garage then get a rear mech in the current CRC sale for nowt.

    Job jobbed.
    Postby team47b » Sun Jun 28, 2015 11:53 am

    De Sisti wrote:
    This is one of the silliest threads I've come across. :lol:

    Recognition at last Matthew, well done!, a justified honour :D
    smithy21 wrote:

    He's right you know.
  • deswellerdesweller Posts: 5,271
    All non-electronic integrated shifters feature swinging brake levers to achieve a gear shift, so you'll still have to deal with that unless you switch to bar-end or downtube shifters.
    - - - - - - - - - -
    On Strava.{/url}
  • MatthewfalleMatthewfalle Posts: 17,571
    But Rival are also carbon so will add 2mph to your top end for no extra effort.

    Other carbon shifters are available but not from me for a bargain price .......
    Postby team47b » Sun Jun 28, 2015 11:53 am

    De Sisti wrote:
    This is one of the silliest threads I've come across. :lol:

    Recognition at last Matthew, well done!, a justified honour :D
    smithy21 wrote:

    He's right you know.
  • MoonbikerMoonbiker Posts: 1,706
    I don't get why you need a new rear mech sounds like your chain is wrong length?

    Do you mean you need long cage one as your new cassette has more than 28t?

    One the dawes website the giro 300 has a 7 speed screw on freewheel so you must have new wheels on the bike with freehub for 8 speed?

    SPECIFICATIONS

    Sizes 700C Wheel, 48cm, 53cm and 58cm Frames
    Frame Alloy
    Fork Steel
    Headset 1 1/8" Aheadset
    Shifters Shimano SL-A070 STI Levers 14spd
    Rear derailleur Shimano RD-A070 7spd
    Front derailleur Shimano FD-A070 2spd
    Chain KMC HV-500
    Freewheel Shimano MF-TZ21 7spd 14-28T
    Front hub36H Quick Release, alloy
    Rear hub 36H Quick Release, alloy
    Rims Double Wall Alloy, with CNC braking surface
    Spokes14G
    Tyres Kenda 700 x 23C
    Chainwheel 170mm Crank / 50-34T Compact Chainrings
    Bottom bracket Cartridge BB 115mm axle
    BrakesAlloy Single Pivot Caliiper
    Brake levers Alloy lever. Part of shifter
    Handlebar72mm Reach, 120mm Drop, 400mm wide (48cm), 420mm wide (53cm) and 440mm wide (58cm)
    StemA-Headset Stem, alloy, 90mm reach (48cm), 100mm reach (48cm & 53cm)
    Seatpost 27.2mm x 300mm
    Saddle Dawes Road Saddle
    Grips Black Cork Tape
    Pedals9/16" with toe clips
    Weight 11.0kg
  • keezxkeezx Posts: 1,311
    You can stick a 7 speed Cassette on a 10 speed HG freehub...
    Cannot imagine that a new, not classic equipped bike should have a screw-on freewheel.
  • MatthewfalleMatthewfalle Posts: 17,571
    I can do you a deal on some used but work perfectly 105 shifters and rear mech if you want .......
    Postby team47b » Sun Jun 28, 2015 11:53 am

    De Sisti wrote:
    This is one of the silliest threads I've come across. :lol:

    Recognition at last Matthew, well done!, a justified honour :D
    smithy21 wrote:

    He's right you know.
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