How to Calculate Chain Length

On one bike I have either the bottom of the range Shimano rear derailleur, or an imitation copy of the bottom of the range Shimano rear derailleur. The spring tension is weaker than many other rear derailleurs. The chain sags more than it should. With a derailleur like this, the chain rides up on the sprockets more than it does with a derailleur with stronger spring tension. This results in the s...

Hi Folks, Posted this on another forum as well. Hope to get the assistance here. I'm not a very handy ebike enthusiast. Don‘t really know the inner workings of an ebike, I just like riding them. Anyway, was riding my Core-5 that has around 1200 miles on it, and suddenly it made this strange grinding sound every time I engaged the throttle or PAS. Visited Ride1up’s support page and read...

We have just changed a gear twist grip as previous broke. Have fitted a shimano 7 speed But now it jumps a gear in the middle. 1st fine 2nd fine 3rd fine But when change to 4th it jumps to the fifth sprocket so then twist gear just goes to 6th But is actually 7th on sprocket. It does the same going down gears, If you just turn twist half way through clicks 3rd / 4th it will go onto 4th. But a...

  20220806_113536.jpg (Size: 33.21 KB / Downloads: 14) Hello To Everyone. Need a help! Is this enough clearance between the lock ring and the fork. Some bike shops say Yes some of them No. The Lock ring was tighten to the specs. I would really appreciate your opinions. Thank you...

Hello there, I had managed to replace my inner tube and outer tyre successfully, however since then I have been trying to re-fit my rear tyre back onto the frame to no avail. Initially I thought the axel was at an angle. I have undone the nuts and bolts many times, rode the bike, then either the tyre starts rubbing with the frame, or the pedals become really stiff to rotate. But today I have r...

Recently bought an Amigo scooter, I went to make a turn and the handlebar locked up, the wheel wouldn't turn and I fell off of the bike. I only had it for a day prior to that and felt it lock up a little the first day but brushed it off. do you all know what the cause could be?...

Can anyone help me figure out how my one day old scooter's handle bars locked up while i was making a turn ? It is the Amigo Polo and I literally had it for one day, is there a way to fix this ?...

I have these Chinese freewheels. On the inside are ridges which are supposed to be there so you can use the tool to remove it. With these freewheels, the ridges are very low. I have a tool, also made in China, and the ridges on the tool are also very low. So when trying to use the tool to remove the freewheel, it does not grip properly, and it can't be used to remove the freewheel. The metal on ...

]Hello.. First post ! In trouble already.. It's years since I last did bike maintenance and then it all seemed to easy.. I've just bought an old Dawes Shuniah mountain bike (£5) that's been very neglected. The rear hub bearing are dry and I need to repack with grease. Looks like the axle is slightly bent as well. First hurdle is the cassette removal (without special tools ) The lock nut is diff...

Make your own strong, inexpensive, freewheel removal tool, using a car wheel nut. The most common bikes with gears, use freewheels. There are other gear systems for bikes, but they are used on less bikes. The tool I will describe is for the most common type of freewheel, as shown in the picture. There are freewheels which require different tools, particularly on older bikes.   free...

My bikes' front and rear tires are not aligned. By this I mean a straightedge held against the front or rear wheel will show an appromixately 2 inch offset as compared to the other wheel. The dealer says this is "within specification". This is the second bike with the identical situation. So the wheels are in a different track. If this were a car they would call this dogtracking or crabbing. ...

The most common bikes with gears use a freewheel hub. Some bikes with gears have other types of hubs. Axles may bend and break in freewheel hubs. Heavy riders are more likely to bend and break axles than light riders. People riding on rough tracks are more likely to bend and break axles than people riding on smooth roads. Axles are more likely to bend and break in hard tails, than bikes with r...

I'm getting Error Code 04H-Throttle Not Return, on the Velowave Ranger. Help please. Anyone else have this issue? Only had the bike for a week!...

I found a Giant manufactured (I assume based on what I have read and that it says Taiwan on the handle bar post) Schwinn Woodlands abandoned outside that I would like to fix up and use. This is some good timing as I love taking my kids for bike/walk adventures, and I am very tired of the terrible bicycle I am using now. I am fairly mechanically inclined, with replacing a turbo charger on my old TD...

Hey guys so I have ~50 years old Cosmos SuperCorsa and the only problem with it is that the rims are bent to the center. I want to replace them but I can't find the exact same brand at a good price. The wheels are from Campagnolo. The bike is 700c with 36 holes. The inner width is 13,5mm and the rim height is 18mm. Are the last 2 measurements not required or it should be exactly as the ones I have...