Questions tagged [frames]

Bicycle frame construction, selection, maintenance, and repair.

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19 views

Help identifying bmx bike

Acs7i07516 is my bikes serial number and I just want some info about the bike, I couldn't find any info so I was wondering if anyone else knew about this bike,any info would be appreciated
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1answer
138 views

Suitability of open sided bearings for frame pivots

On a 10 year old bike I am trying to replace miniature frame pivot bearings which measure 9mm x 17mm x 4mm, pictured below, and are sealed with 689z stamped on. They must measure the same dimensions ...
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3answers
1k views

Which measurements are most important to consider for tall men?

I am 6'8" and 255lbs so my figure is a bit between Kevin Durant (not as skinny) and Lebron (in shape but not as muscly). For smaller bikes such as what you would find in Wal-mart, I frequently see ...
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1answer
78 views

Help identify my bike frame

Please help me identify a mystery bike that I purchased at a garage sale and have grown to love. I am not sure what is original to the frame but the bike has a 56cm frame, Shimano SFR rear dropout, a ...
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2answers
640 views

How often do you need to lubricate alloy seat posts

I own two tourers which I normally relubricate their aluminium alloy seatposts every spring with high quality grease. Due to moving to Cambridge and the coronavirus outbreak, both cycles are being ...
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2answers
124 views

Need help identifying a frame

Recently bought a used bike, the guy who sold it said it was an 80s/90s Schwinn steel frame. Checked it with a magnet so I'm pretty sure it's steel but I'm not sure about the model, brand, or the year....
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2answers
788 views

How to get water out of the frame?

Now the (seatpost and QR) has been practically replaced by an (internally routed riser setpost) tightened with a torque wrench. I disagree with the accepted answer here - sometimes above 1 liter of ...
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1answer
70 views

22 inch frame mountain bike for someone who is 5'8"

I'm 5'8" and had my mountain bike stolen in the fall (bummer!). Just found a really good deal on a 2015 Giant Revel but it's got a 22 inch frame. Would this be unsafe/unpleasant enough that I shouldn'...
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2answers
115 views

Help with choosing steel frame

My most recent bike was a Trek Domane SL6 that I loved, but the frame has started to show some cracks and I am looking at switching over the Shimano Ultegra components to a steel frame. I am a big ...
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1answer
48 views

Bottom bracket damage work-around

I built up a Specialized Rockhopper over this last summer, ending up with a sleek, blacked out, Deore & XT equipped thing of beauty. During a brief stop at a buddy's place, the 12mm Kryptonite ...
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2answers
100 views

Is it possible to change a painted frame into a chromish one?

I have a fixed gear bike and I'd like to give him a fresh start. It's all painted in blue and I'd like to know if it's possible to obtain the chromish color on the links between the tubes (it's an old ...
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1answer
114 views

Dent on aluminium frame?

I have a Cube Stereo 120 2018. When I was driving today a car hit me. I'm fine but the bike has a dent in it made by the car door. Can it be fixed? Can I still ride it, and go MTB? Can I make a sort ...
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1answer
268 views

Repair frame with crack by seatpost clamp

Is it feasible to repair a crack in a frame around the seatpost clamp? Being an aluminium frame I understand soldering is problematic. It doesn't matter if seatpost is fixed in place as per a solution ...
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126 views

Downhill bike frame conundrum

So I am starting a bike from scratch and really want a downhill frame as I'll be riding downhills and commuting. How and what parts could I use and add to the frame so it is able to commute though I ...
4
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1answer
116 views

What does the DIN number refer to …?

I am working on understanding this document for an n55 trike frame build ... http://www.n55.dk/MANUALS/SPACEFRAMEVEHICLES/DIY.pdf Particularly this line: M6 SELFLOCKING NUTS, stainless (DIN985) - ...
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1answer
160 views

What make of frame

Could you tell me what company makes this frame please,it's all alloy with the letter M moulded into it behind the saddle stem shaft but no other markings.
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4answers
2k views

Should I buy this bike with a dent in the top tube? Is it safe?

I'm considering buying this used steel-frame bike. But the top tube has a small dent (about one-third of the way from the saddle). Is this a problem? I plan to use it daily (~6-7mi) for commuting to ...
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2answers
131 views

I have an 8-speed GT Aggressor Pro and I want to upgrade it to have 12 rear cogs

I found a really cheap 12-speed SRAM groupset, and I want to know if I can just get a new rear wheel or if I need a new frame.
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7answers
6k views

Can this crack in the steel chain-side dropout be welded?

I have a thru-crack on the driveside dropout near where it meets the chain stay. The bike is an early 1980's steel frame Trek mountain bike. See pics. Bike rides fine otherwise and I have invested ...
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2answers
121 views

Frame size is smaller than recommended

I'm 191 cm tall and I want to buy UPTEN ZERO, the problem is the biggest frame size is "L" and is adapted for (173cm - 185cm) only, my question is it ok to ride a small bike? dose it effects me or ...
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2answers
159 views

Help identify BMX please - possibly 80s or early 90s

I recently picked up this old BMX bike for AU$5 at a garage sale. I was originally only interested in the Skyway Turbo Disc chain wheel, but decided I would strip the whole thing and give it a new ...
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2answers
253 views

How much flexibility is normal for steel frames?

I have an 1980ies steel road bike which I used to ride clipless pedals on. I have recently switched to platform pedals for commuting and found out that when I'm coasting and move my feet left and ...
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1answer
81 views

How do the wheels attach on this trike design?

How do the wheels attach on this trike design? Here are the design drawings. If you go to the section titled Steering Bridge Components you can see were it should attach. However it does not show ...
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2answers
261 views

How to degrease a bicycle frame?

I have a carbon frame which I'm worried I will scratch the paintwork on. I know the basics of cleaning paintwork without scratching it, using two buckets, one to rinse and one to wash with, grit guard,...
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0answers
81 views

identifying a mtb frame

about one or two years ago my brother has brought this bike home and i am now thinking of restoring it. It has an alloy frame unsure of the size but the wheels are 27.5", feels strong and solid... But ...
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0answers
157 views

Can anyone identify this green frame?

Like many others, I found this aluminum frame bike that is pretty light and in great shape. The bike has been converted to disc brakes and I believe that everything is aftermarket. Serial number ...
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3answers
199 views

Installing gear cable guide on 80s Holdsworth

I have this Holdsworth frame that I got repainted and am rebuilding with mostly modern parts - I recently realised that I'm not quite sure how to run the derailleur cables past the bottom bracket. I ...
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2answers
520 views

Titanium seatpost in steel seat tube, good idea?

I want to use a titanium seatpost in a frame with a steel seat tube (Columbus Spirit tubes). Is it a good solution? I want to understand if the metals play well from a structural point of view, and I ...
4
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1answer
156 views

Will these dents make this aluminum bike frame unsafe

Yeah is this small dent fatal?
2
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1answer
67 views

Building a 700c bike. Hub sizes

Trying to build a bike on a cyclocross frame. So the wheel will be 700c. Need hubs. Fork size is 100x15 with thru axle. Rear drops size 142mm x 12mm thru axle also. So it means I need any hubs which ...
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3answers
1k views

Is it safe to run disc brakes up front on a mountain bike that lacks a disc caliper mounting point in the rear?

Upon sharing my thoughts in an answer to a Bicycle Stack Exchange question, I wondered about my suggestion to use a disc brake up front on a frame that, lacking a disc brake caliper mounting point at ...
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52 views

BMX bike brand frame

Can you help to tell me what this frame is
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1answer
217 views

What brand of frame has a star cutout behind the seat?

What bmx bike has a star cut-out just behind the seat? sealed bb.
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2answers
109 views

How is chainstay length defined for frames with horizontal dropouts?

Just reading our own definition of Chainstay Length in the terminology index. It is written currently as the distance between the centre of the chainring and the centre of the rear cog. This is ...
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0answers
30 views

Rear shock mounting hardware for Felt Virtue 2015

I recently bought a Felt Virtue 2015 aluminum frame. Just wondering if anyone else who bought the same frame have the correct sizing for the rear shock mounting hardware. For reference this is the ...
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1answer
87 views

How to treat rust spots on a steel frame without stripping the paint completely?

I have a 1974 steel French road frame and most of the original paint is still intact. However, there’re quite many 1-2 cm surface rust spots. I also recently had one of the lugs partly re-brazed and ...
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2answers
160 views

Bought a frame one size larger, how to fit for slightly smaller rider?

I've recently bought a frame that is about one size larger. It's a 22" frame and my height is about 5'9". I had a choice between the 22" frame and an 18" frame so I chose the frame that was a bit ...
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3answers
94 views

Identification of non-standard frame feature and suitability of frame for mid-drive e-bike conversion

My question comes in two related parts: firstly, what is the piece of folded, drilled metal projecting rearwards from the lower bracket in the photo above? Secondly, does this piece of metal have ...
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1answer
252 views

Bike too big or just fine ? modification required ? Need pro advice

Hi I accidentally refer to wrong bike fit and purchase online a 20" Frame Mountain bike (XC hardtail)! While the bike is about 20" (51 cm) Frame , I'm about 175 cm (5 foot 9 inches tall and go 79.x ...
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2answers
2k views

Can you change your skewer frame into to thru axle one?

I have a frame that uses QR skewers. Can I modify the frame to use thru axles?Has anyone done it??
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0answers
93 views

Help in identifying our newest project

Any help getting info on this bike would be great. Only tags/badges are a Japan stamp and a diamond with a 5 in the middle under the frame. Thought maybe a Japanese knockoff from Schwinn but the bars ...
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2answers
229 views

What type of bicycle frame is this?

Need help with identification. If anyone knows what kind of bike has the rear fender built in to the frame, that might help.
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2answers
137 views

Is “touring bike” a common term in the USA?

Just researching some bikes online and, being from the UK, I cannot find any bikes on US websites called 'touring bikes', as we'd commonly call them in the UK. By this, I mean bikes which come with ...
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1answer
411 views

Remove stickers and decals from frame

I am trying to remove the stickers/decals so I can repaint the bike. I have tried scrapping, paint thinner, and xylene. I also tried using a heat gun, but the process seems rather tedious. Is there ...
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1answer
37 views

Identify tandem frame with no LK99040060 [duplicate]

Looking to identify my tandem frame It was bought without decals and buyer claimed it to be a Gary Fisher but I want to know for sure before I have it refinished. It has eccentric bottom bracket ...
4
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3answers
708 views

Is this crack on my seat stay mechanically safe?

Recently picked up a steel frame and realised there was a crack on one side of the rear triangle, right by the seatpost. Crack seem to be contained towards the outer part of the tube so does not seem ...
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3answers
175 views

Can a Mamachari be fitted with an 11 speed 52-36T crankset and FD?

I would like to upgrade this bike with a better and faster crankset, 52-36T, but I'm confused if my planned setup will be compatible with the bike I have. I have consulted in our local bike shop and ...
5
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0answers
272 views

Scrap it or not

I purchased this Bottecchia full-carbon frame a a few years ago and built it up using Shimano 105 components. Shortly after the build was done it came off the rear mounted rack on my car and went ...
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1answer
885 views

How can I identify my bikes make through the serial number?

I can't identify my bike so I was hoping someone could help me... The serial number is AX365316
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2answers
726 views

Install suspension forks on non-suspension bike

I have a 1990s Saracen PowerTrax. Is there a way I can install a suspension fork, or will that muck up the bike somehow? I'm actually interested in ways to raise the bars with respect to the seat, so ...

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