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New Shimano CN-HG-50 HG50 8 Speed MTB cycling bike chain for Alivio Acera Deore $7.59 |
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Microshift MTB Groupset 3x8 24sp (shifter Front rear derailleur) shimano $25.44 |
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REYNOLDS XC CARBON 26" MOUNTAIN BIKE WHEELSET 6 BOLT DISC TUBELESS SHIMANO NEW $599.00 |
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G2C New S400 Shimano disc brake black hardtail mountain bike 24 speed 34 lbs 19" $299.99 |
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G2C New S400 Shimano Disc Brake green hardtail mountain bike 24 speed 19" $299.99 |
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G2C New S420 Shimano disc brake red hardtail mountain bike 24 speed 17" $299.99 |
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G2C C129 Shimano disc brake Full Suspension blue mountain bike 21 speed 16" $269.99 |
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G2C New S420 Shimano disc brake blue hardtail mountain bike 24 speed 17" $299.99 |
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Shimano Deore Mountain Bike V-Brake Shoe Pad Set NEW $0.95 |
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Shimano STX MC40/T400 Mountain Bike V-Brake Shoe Set $0.95 |
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Shimano Bicycle Bike Disc Brake Oil Mountain 50ml $25.64 |
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Pro arch Shimano cycling stickers decals bike racing frame road MTB new lot $3.99 |
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New Shimano PRO XCR MTB Bike Stem 31.8 mm clamp, 120mm $94.95 |
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New Token Ceramic Bottom Bracket BB MTB BIKE Shimano $89.50 |
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Shimano XTR RD M980 Long Cage SGS 10 Speed Rear Derailleur MTB New $189.00 |
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Shimano Deore Mountain Bike XT BR-T780 Cycling XT V-brake Rear $42.00 |
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Shimano XT RD M773 GS Dyna Sys 10 Speed Rear Derailleur MTB New $80.00 |
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CN IG90 IG 90 SHIMANO NARROW CHAIN NOS Road CX MTB Fitness Bikes Bicycles NOS $49.99 |
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SHIMANO PD-M520 MTB BIKE SPD PEDALS - SILVER $21.00 |
how to adjust drive train on mountain bike?
I bought used, cca 8 years old, Schwinn mesa gsx mountain bike with shimano stx drivetrain. I can't shift through all 7 back gears (chain can't slide to 2 smallest gears). I tried to adjust it with those little screws in the back, what probably was wrong. I also tried to adjust shifting cables and it didnt help.Can anybody help me out!?
The first thing to consider is the condition of the drive train, specifically the cables and the derailleurs. Did you replace the cables? If not Did you remove them and lube them with oil or synthetic lube (NO grease). Next would be to make sure the derailleurs are lubed at the pivot point. (notice the body shaped like a paralellogram...Lube these points to make sure movement is not comprimised. It goes w/o saying but the chain should probably be lubed, preferably replaced.
Once cleaned and lubed the next thing to go is start by adjusting the rear deraileur. The 2 little screws are used for this. My starting point is the smallest cog position. Move the shift lever to the position that would normally position it in the smallest cog. It can also be a good idea to completely loosen the rear cable here. Now for the screws. The upper screw, Usually is the one that corresponds to the high gear, which is your smallest cog. What you need to do here (w/ a loose cable) is adjust the rear derailleur so that the top cog aligns with the small cog on your freewheel. For good measure you can move the derailleur back and forth with your hand to see if it returns freely to the same position and is aligned with the small cog when looking from the rear.
Next step: Connect the rear derailleur cable. Now the next thing you may want to do is check the adjustment on the other end (large cog). Spin the wheel and move the derailleur to the large cog with the shift lever. If you can't make it to the top, then loosen the lower screw on the derailleur. If it goes to far, or shifts off the rear cogs between the spokes, tighten the lower screw. (Be careful here. If it appears to be coming off and shifting between the spokes, stop and adjust the derailleur). Turn the 2 limiting screws only about 1/4 turn at a time when the upper and lower limits are close.
Now that the upper and lower limits are set you can work on adjusting the shifting. Shift to the small cog again. Now, while turning the pedals, shift up only one click. If the chain has trouble moving to the 2nd cog, then turn the rear adjusting barrel towards the direction the wheel (i.e. tighten the tension on the cable). If it goes up more than 1 cog with that first shift then loosen the tension by turning the adjusting barrel towards you. If the chain landed in the second gear smoothly, then shift again to see how it goes in to the next gear. Go up and down one click at a time. Use the adjusting barrel to fine tune the adjustment and make sure the shifting is smooth. Usually you can see, or hear, the chain if it's slightly offset on the cogs. A rule of thumb is to turn the adjusting barrel in the direction that you want the chain to move to.
If this doesn't work, there could be other problems like a missaligned derailleur hanger (the part of the frame that the derailleur is mounted to), or even a possibly bent derailleur. This is not abnormal, especially on a mountain bike. If all else fails or if you're not comfortable making the adjustments yourself, the local bike shop will be happy to assist.
Regards,
ken
Shimano Dyna-Sys Mountain Bike Drivetrain System
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