Tag Archives: Schwinn

In the last post, I described changing the inner tube on my daughter’s bike and then finding that the crank was grinding. It was so bad that it felt like metal on metal. When we brought her home last year, I noticed the crank had a ton of play in it and had a grinding feel when turning and knew that meant the bearings in the crank/lower-bracket were bad.

I’ve not worked on the crank of a bike for probably 40 years – literally. I had a vague idea of what to do but some details have changed over the years and I had to do some reading. Given that I had to really dig to figure out what to do, I figured it was worth sharing this also in case someone else has “what in the heck is this?” moment with one of these Schwinns or a bike with a similar setup.

Here’s the bike upside down. I have it resting on a work table with the handbars clamped onto a wood working vise. A weird way to hold it but it worked. It just so happens the bike basket helped stabilize things.

I had to watch a bunch of videos and read some blog posts to get an idea of what to do. I thought “crank” applied to the whole assembly but it turns out the correct term for the innards is the “bottom bracket” and cranks just appear to the lever arms the pedals attach to.

Here’s the approximate sequence of what to do

I’m writing this a few weeks after doing the actual work but hope it helps if you find yourself in a similar bind:

Step 1: Remove the left and right cranks. They are pressed in place and I had to buy an actual purpose built puller to get them off. None of my generic gear pullers would work.

You remove the obvious bolt and then use a purpose-built puller that threads into the crank all the way and then tighten the center bolt to push the crank off. The Schwinn needs a puller that has 22mmx1mm threads made for a square crank.

Park makes two tools – the one I used and the one I bought for future use. I bought and used the CCP-22 crank puller but I would not recommend it. Both cranks were on so hard that I had to hit the handle with a dead blow mallet to get it to turn. At least for the bike I was working on, the integral handle wasn’t sufficient to remove the crank.

Here’s the Park CCP-22 crank puller in use. It did the job but the handle alone didn’t give me the torque I need.

After I got done with this bike, I bought a CWP-7 that they call the compact version but what is appealing is that it has a hex head that I will engage with a socket or impact wrench to do the job far easier, I wouldn’t recommend the CCP-22 unless you know the crank is going to come off easy.

Step 2: Loosen the lock ring. When you look at the bracket, you will notice it is threaded and goes into the frame. Securing it is a locking ring that is threaded and is tightened against the frame to apply pressure. You loosen the locking ring by putting a punch in one of the little “notches” and tapping the ring so it will turn counter clockwise. It will come lose and turn very easily. Just move it a few turns from the frame but leave it on the bracket – you do not need to remove it all the way.

The locking ring is the part with the little rectangular notches right against the bike frame. The first evidence of this think being whipped together is here. Look how “smashed” the notch is at about the 2pm position. Regardless, it came free quite easily.

Step 3: Remove the non-geared side of the lower-bracket. If you look at the photo above, you will notice there are splines radiating inwards on the bracket. You need to measure the diameter and count the number of splines in order to buy the correct size wrench to remove this part of the bracket. This one was about 31.5 mm inner diameter and had 22 splines. The Park BBT-22C tool fits these. There are many different sizes so you really to confirm this.

Here you can see my BBT-22 tool on the end of a big 1/2″ E-Z Red extendable wrench with a Tekton 1/2″ to 3/8″ socket adapter. I like to have plenty of torque when I need it. You can also see the dead blow hammer on the left that I had to use to beat the Park wrench to remove the cranks. You can also see the punch and hammer used to tighten and remove the bracket’s locking ring one one of the two bearing assemblies.

I used the above pictured E-Z Red wrench and BBT-22 adapter to remove the bracket, When the bracket came out of the frame, I kid you not, ball bearings fell out. What a mess.

None of the ball bearing assemblies were intact, there was no grease to speak of and the rusty sludge that I had to clear out of the frame had remnants of the ball bearings and the cages/retainers. There were literally no ball bearings supporting the crank axle/spindle. The axle was just turning directly on the ends of the lower bracket! No wonder she was complaining it was hard to pedal

Step 4: Remove the geared side of the bracket. This comes off very similar to the non-geared side with two exceptions. First, it is reverse threaded. Turn clockwise to remove the bracket on that side. Second there is no lock nut. The proper tensioning of the bracket is done from the non-geared side. By the way, if you maneuver the crank and gear assembly around a bit, you can leave the chain in the derailer.

Step 5: Thoroughly clean and grease the frame’s tube where the bracket was at. You do not want debris to get into your brand new bearings. I had a ton of crud to get out and then I liberally greased the walls.

Step 6: Reinstall the geared side of the bracket. Remember that it is reverse threaded and it goes in all the way. The final adjustment is done from the non-geared side. Note, I put a lot of grease in the dome before screwing it back into the frame.

Tip: Re-install all threaded pieces such as brackets and bolts by hand to make sure the thread is properly aligned and not cross-threaded. Use a wrench to tighten things down only once you know the threads are properly mated.

Step 7: Grease and install the bearings. I had grease everywhere at this point and didn’t want to touch my phone. Normally you would be able to see your old bearings and have an idea of what to buy. All I had were some rusty ball bearings and pieces of the retaining rings. So, I did some digging on Amazon only knowing I had a Schwinn bike and needed bearings with an inner diameter based on the axle or shaft between the cranks of about 0.72″ and an outside diameter of about 1.14″ (29mm).

Okay, I got lucky. In reading the comments of a lot of different bearings, a 1/4″ x 9 ball unit from Jaceyon popped up with people reporting they worked on Schwinn bikes. I was running out of time so I ordered them and they worked!

Tip: The Jaceyon bearings were fairly cheap and got good reviews. It came with four bearing sets – meaning two pair. For some reason I busted one during installation and was very happy I had a spare. For $9.28 (at the time), it was totally worth it. If you can swing it, I’d recommend getting four so you have a couple of spares just in case.

Use wheel bearing grease to pack the bearings as best you can. I apply a lot of grease to all surfaces including the bracket face, the axle/shift and the bearings. I like to use a synthetic wheel bearing grease, such as Mobil’s, because I find it doesn’t ooze oil like normal grease does. In the end, use what you have but just be sure to grease the bearings before installation.

When you install them, there is a proper orientation. Please look at the inside ends of the brackets – they are domed. This means the exposed bearings will engage with these ends. The flat part of the housing faces the inside of the tube.

This is the front or top of the bearing. It will be facing outward from the bicycle such that the bearings are engaging on the domed surfaces of each end of the bracket. Those are some remnants of the original. I don’t think any grease was applied during assembly. By the way, some will refer to the ball bearing group as a set or say that the bearings are caged. No matter how you look at it, the retainer properly positions the balls around the crank’s axle to allow it to turn freely. You can imagine that if they rust it will be game over pretty fast. The retainer is just folded sheet metal.

I slide the geared side bearing and the axle in. Again, make sure the bearings are facing outward so they will engage with the bracket. I then put a bunch of grease in the non-geared bracket end dome and hand screw it back into place.

They will go in like this with the ball bearings facing out on each end. I have not greased these yet and this set of bearings is just sitting on the end of the installed bracket for the purpose of this photo. If it were really being inserted, I would have it covered in synthetic wheel bearing grease.

Step 8: Tighten the bracket and install the lock ring. Now this part may take some tuning. By tightening the non-geared side, you are compressing the bearings into place. Tighten the bracket until the crank axle can no longer wiggle but it can still turn. Do not use a huge wrench here or rush – you can smash the bearings – I’ve done it. Tighten a little and feel the axle, over and over.

Step 9: Tighten the lock ring. Use a punch and hammer to rotate the ring clock wise and lock the bracket back in place.

Use a punch or whatever tool you want and a hammer to tighten the lock ring and secure the backet.

Step 10: Reinstall the cranks. Situate them on the shafts and use the center bolt to press them back into place on the axle as well as lock them there. Each crank arm should be 180 degrees opposite of the other. The square ends of the axle are intended to make this easier 🙂

Reinstall your chain too when you are wrapping up the gear-side if you haven’t already,

Step 11: Give it a test ride. If it makes a creaking or groaning noise when you pedal either the bracket needs more tightening or you trashed the bearings. If the sound will not go away, you will need to take it back apart because the bearing probably failed for some reason. That means you go back to step 3. Hopefully you will not have this happen. It did to me the first time and luckily the bearings I bought were four sets to a bag. I’m really not sure why it busted but I am glad I had a spare.

Videos

I didn’t find any exact videos, which is one of the reasons why I wrote this post, but there are videos that can give you a better idea of what is needed. I’m hoping that between my post above and your watching these videos, you will have a pretty good idea of what needs to be done.

Conclusion

With this done, the bike was all set for my daughter to use again. I don’t think a ton of care was taken during assembly and really wouldn’t be surprised if little to no grease was applied to the bearings.

I hope this helps you out.

6/27/2021 Update: The bike is still doing just fine. No problems with the crank and bearings at all.

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DIY - Do It Yourself, General

Replacing The Inner Tubes On A Schwinn GTX-1 700C Woman’s Bike – Model S5230

October 19, 2020 RoninsGrips

Growing up in the 70s, Schwinn bikes were real popular as there was a dealer in town. Over the years, the brand has been bought and sold and is owned by Pacific Cycle now. The bikes are made in Chang Zhou China and are sold through places like Walmart and Sam’s Club.

With that said, my daughter needed a bike and we bought her one in 2016 from Sam’s Club. It was already assembled so I was happy I didn’t have to mess with it. Growing up in a rural area with few kids around, one of my hobbies was fiddling with my Sears Free Spirit 10-speed and often needing my dad to bail me out when I messed things up — I tend to learn a lot by screwing up 🙂

At any rate, the big went with us on a number of trips over the years and went with my daughter to college. It’s hard to beat having a bike on campus to get around and we invested in a basic rear basket for two reasons – the obvious was to let her throw stuff in it. The other was that it could block the water and mud that otherwise throws a stripe up your back when you have to bike in the rain.

Installing the basket required buying the Ibera adjustable rear rack, installing a piece of wood that I painted black to block the water (you could use any solid you want) and then the Axiom wire basket. I found them on Amazon and bought based on specs and reviews. I did have to get longer bolts from Ace Hardware to connect the basket to the rack due to the wood insert.

Here’s the exact Ibera rack I bought:

And this is the wire mesh basket:

The Call…

The bike worked great until I got a call – “Dad, I have a flat – what do I do?” Well, we live just over an hour drive away so the next time we went up, I brought the bike back.

What Size Inner Tube?

Many bike tires, such as this Schwinn, have an inner tube and eventually it cracks or a hole gets poked in it. Some folks patch their inner tubes but I just replace them – especially given the age of the bike and that I knew it was an original tube.

The info you will need to get a replacement tube is on the side of the tire (not the tube). You may see the ETRTO (European Tire and Rim Technical Organization – or ISO) number marked as XX-YYY where XX is the tire’s inner width and YYY is the inner tire diameter. On this Schwinn, it is 40-622.

You may also see an older French sizing that is marked something like AAAxBBm. AAA is the approximate tire outer diameter and BB is the width. There will be a letter at the end “m” is the inner diameter. I ike the ERTO method better – it just makes more sense to me. At any rate, the Schwinn had this code also: 700x38C.

Okay, so armed with that info, I hopped on Amazon and started reading reviews. I didn’t want to buy a cheap tube and have it give out prematurely so I looked at Schwalbe – an old name in German inner tubes. I also used their website to confirm the size I needed – their AV17 model. which fits 700x38C, 28×15 or 40-622 tires and has a Schrader air valve. I bought two because if the one was aging, which was my suspicion, I bet the other was as well.

Tip: If you are in the US, you will want a tube with a basic Shrader Valve to inflate your tube. This is the most common type of valve and you will find it on cars, trucks, tractors, and so forth sold in America – it’s nickname you may hear in other countries is the “American Valve” for that reason. There is another type known as a “Presta Valve” and it is unique. Only buy a tube with that type of valve if you know you need it. There is a third type called the “Woods Valve” or “Dunlop Valve” but that tends to only be in the Netherlands and parts of Asia.

Last comment – there are a ton of bike tubes on Amazon and at stores. There are also different types such as ones that are self-sealing, etc. The choice is up to you, your budget and whether you mind changing the tubes or not. Since my daughter is not readily available and the bike is a big help to get at school, I spent $14 per tube vs. $5-6/tube for tube-shaped objects that may or may not hold up. Read the reviews and you decide.

Replacing The Tube

There are how-to videos out there you can watch if you want. Basically if the tube is already flat, you pull the tire off the rim a side at time. You can use a blade screw drive to help get it started off the rim but I find most of the time if I push the tire away from me while lifting off the rim, I can get it started and then just work my way around. The old tube should just lift right out of the tire unless it stuck due to glue or something from a past patch.

Note, if there is no inner tube on your bike, you have a tubeless tire and the leak may well be in the tire itself.

A nice part of the design is that you can pull the rear tire without having to remove the derailer. Back in the dark ages, that was not the case so you wound up with some really dirty hands.

Before you install the new tire, look at the rim and make sure there are no spokes protruding into the area where the tube is at. Your rim should have either have something rubbery to protect the tube glued in place or at least some type of tape. They sell protective inner tube pads or you can even try putting in 2-3 layers of PVC electrical tape. If you go the tape route, you will need to cut a hole for the inflation tube to stick out.

To install the new tube, put in the tire. Yes, put it in the tire – not on the rim. It’s designed to fit the outside diameter of the tire and will not fit otherwise. So, tuck it into the tire and then push the air valve through the hole the rim. A perk of using Schwalbe tubes is that they have a lock nut you can snug down to hold the tube in hole.

You then tuck the tire into the rim. Depending on the fit, you may need to do a side at a time or be able to do both at once. Take care not to pinch or cut the tube.

A trick I learned years ago is to partially inflate the tube and then gently bounce it all the way around to try and ensure the tube is not caught between the tire and the rim. Not everyone does this so it’s up to you. I then bring it up to pressure and re-install it. I check the air pressure a few hours later to make sure it’s sealed and no punctures happened.

Again, because I suspected the age of the tires was the culprit, I did both tubes. It’s up to you.

Videos

In case you have questions, here are some videos that others have created and posted on Youtube that demonstrate how to remove and install inner tubes:

Conclusion

I hope this helps you out when it comes to the tubes.

thought I was done and then I felt the cranks were grinding horribly. That bugged the heck out of me because I knew it meant to bearings were history and that will be the topic of the next blog post.