Black Rock Bicycles  * Reno, Nevada *  775.972.3336

Hi all.

It’s springtime, even though it doesn’t look like it. The riding season will be here shortly and it will soon be that time to hop on that trusty steed and rip down the trails.

Just one problem; the brakes are spongy, the chain is rusty and the tires are flat. And that noise coming from the bottom bracket just isn’t right.

All of us have been there. That is why we have created the PRO RACE DOWNHILL BIKE TUNE-UP. This service will make your DH bike ride and sound like the pros. Whether you are riding on your favorite trail or racing down Dogbone, this service will make your bike the best that it can be.

Cost: $149.99 plus parts
Contact: curtis@blackrockbicycles.com or eric@blackrockbicycles.com or call the shop at 775.972.3336


Intense M6 dh bike stripped down for the Pro Tune-Up

PRO Race Downhill Bike Tune-up

Step 1. Spray wash bike with special bike cleaner, clean and scrub off any dirt or mud.
Step 2. Dry the bike off starting with the chain and cassette, to prevent rusting.
Step 3. Adjust seat post so that the bike can be placed into the repair stand. Lock bike securely into bicycle repair stand.
Step 4. Loosen front axle on fork and remove front wheel.
Step 5. Shift rear shifter into the smallest cog on the cassette, usually 9th gear.
Step 6. Loosen rear thru axle and remove rear wheel from bike.
Step 7. Now that both wheels are off the bike, two brake pad spacers are placed into front and rear brake calipers‘, to prevent brake pads coming together. (Only temporary because we will check your brake pads to evaluate condition and replace if needed.)
Step 8. We remove front brake from fork and handlebar using 5mm and 4mm allen tool.
Step 9. We remove rear brake from rear swing arm and handlebar using 5mm and 4mm allen tool. .
Step10. Cut and remove shifter cable and housing from bike, Throw away old cable and housing.
Step 11. Remove chain at master link from bike using special PARK tool. Place chain into special chain cleaning solution.
Step 12. Remove rear derailleur from dropouts using 5mm allen tool.
Step 13. With the chain off the bike, remove crank arm bolts, usually 8mm allen tool and crank arm puller tool from PARK tools. Remove drive side and non drive side cranks.
Step 14. We are able now to remove the BB using deep spine BB tool. Then we remove the chain guide from ISCG tabs or bb mount.
Step 15. Moving towards the front of the bike, the front fork is slowly removed from the bike.  We then loosen all the top crown bolts to pull apart the headset.
Step 16. With the bolts loosened, the fork is pulled of the bike.  The stanchion tubes are then separated from the crowns and steerer tube. This gives us access to inspect fork movement and to evaluate the bushings.
Step 17. With the fork off the frame, the headset cups are pushed out of the frame using specific headset puller tools.
Step 18. Remove the rear shock from the frame, while inspecting DU bushings, bolts, spring and tables.

Step 19. With the rear shock off the bike, the swing arm is now free to float up and down through the travel. If the bearings feel “crunchy or rocky” they will be pulled out of the frame and swing arm with special bearing removal tools. Depending on the frame manufacturer, we may be able to remove the rear swing arm.
Step 20. With just the front triangle of the frame left, the seat post and seat post clamp are removed.
Step 21. With all of the parts arranged on the counter, the direct mount stem bolts are removed from the top crown of the downhill fork to ensure no movement in the previous year’s crashes or falls.
Step 22. We remove and inspect the cassette from the rear wheel, using a specific cassette tool and chain whip. We measure the chain with a special chain measurement tool. (park tool recommends a new chain every year for serious downhill riding.) An old chain is flexi and super noisy. (Sam Hill’s mechanic Jacy, replaces Sam’s chain every weekend!!)
Step 23.  We inspect both tires. If the customer wants or needs new tires, this step is used to pull off the old tires.
Step 24.  With the tires off the wheels, this is the best time to “true” the wheels.
Step 25.  We then clean, scrub, de-grease all moving parts, drive train, axles, headset, and shifter.

END OF THE TEAR DOWN SESSION.

At this point in the PRO Race Downhill Bike Tune up, every part of the bike has been pulled apart and cleaned. Next we inspect and evaluate what should be replaced or adjusted. We inspect brake pads, chain, cassette, chaining, grips, tires and tubes. The typical items that need to be replaced are brake pads, tires and chains.

Step 26. First we grease and install the seat post clamp and the seat post to the correct height and place the seat post back into repair stand.
Step 27. Then we install the rear swing arm, and the rear shock. Bolts are torqued to the correct settings from the manufacturer, keeping the shock bolts loose for now.
Step 28. Install the headset with the correct park tool headset press. Grease headset bearings.
Step 29. Next we install the top crown and lower crown steerer crown assembly. Slide fork stanchions to correct height, making sure the bump stoppers are in the correct place.
Step 30. Install the headset spacers and torque the stem bolts and secure the handlebar.
Step 31. Install a new shifter cable and housing, attach the rear derailleur to drive side dropout.
Step 32. Grease and install the BB properly torqued to specs.
Step 33. Then bolt the chain guide back to the ISCG mounts. (Keeping those mounting bolts loose until bike is back on the ground to check alignment).
Step 34. We grease and install cranks, starting with the non drive side. Torque, and then install drive side.
Step 35. If a new chain is required, we will install it now.  If not, we will install the original chain and check length. (Most downhill bikes require three to six links to be removed from the original size of 112 links).
Step 36. Install clean cassette to free hub body on rear wheel to correct torque settings. At this point we also check disc rotor bolts.
Step 37. Install rear wheel and grease thru axle, tighten axle.
Step 38. Grease front axle and install the front wheel.  Torque axle bolts to spec.
Step 39. Install front and rear brake calipers and front and rear handlebar clamps. (This is when the new brake pads are installed if needed).
Step 40. Re align both brake pads so they hit the rotor at the proper place.
Step 41. Adjust the rear derailleur set screws and set cable tension. Pedal thru all the gears to check cable tension and shifting.
Step 42. At this part of the rebuild, we drop the bike out of the repair stand to get a real view of the handlebar angle, head angle, BB height, chain guide setting, and seat angle.
Step 43. With slight pressure on the rear shock, we tighten the rear shock bolts to prevent ovalization of frame.
Step 44. The three 4mm bolts that hold the chain guide to the frame are torqued.
Step 44. The seat angle and seat post height are checked.
Step 45. A second look is done at all bolts and pivots.

At this point the customer will be brought in to adjust the suspension sag. A proper suspension setup is vital for optimal performance. Most downhill bikes have too much preload turns on their rear shock causing the bike to bounce over bumps, making the shock work too hard. This is also a great time to adjust the fork spring rate, especially if it is an air fork. After having this service done, customers give great feedback on how their bikes ride. Your bike will be quicker, quieter and will run better than new. This completes The PRO Race Downhill Bike Tune up.