0
votes
1answer
99 views

Flat tire keeps occurring while bike is stationary. MYSTERY

I keep changing my tube. It get's a hole right near the base of the valve. I've checked the rim, there's nothing sharp. there's nothing sharp in the tire (the hole's on the inside anyhow). and it ...
3
votes
2answers
186 views

Validity of UCI motor concerns

In the wake of the seemingly renewed post-race examinations for 'mechanical doping' by the UCI, I was wondering if anyone has experience with the motors in question (like the Vivax Assist - thanks, ...
7
votes
1answer
173 views

Why fixed-gear for track racing?

I have what seems like a really simple question, and yet I didn't manage to find the answer. Why do track races require fixed-gear bicycles, as opposed to single-speed freewheeled bicycles? Is it ...
3
votes
1answer
84 views

bicycle pedal design specifications for threads

Where can I get information on the various different types of threads used in bike pedals as each manufacture has its own specifications? Different manufactures of pedals have different threads and I ...
0
votes
2answers
156 views

Is any major manufacturer working on a 12 speed group?

So, 11 speed groups are great, but as everyone knows, they are old news and manufactures are constantly innovating and upgrading to sell "this year's" new parts. 11 speed has been around for a ...
0
votes
3answers
53 views

Ideas for consistently popping tubes

I ride a cyclocross about 50 miles a week. About half of the mileage is spent on roads, the other half on single track trails. In the space of 3 weeks I have had the tubes pop 5 times. Once the back ...
1
vote
0answers
65 views

30's-40's bike, make and model

hello, Any info on this bicycle, it make, model and possible year. The young man was born in 1931
1
vote
1answer
90 views

converting stem shifters to brifters

I'm new. I'm 26, from the UK and until last year I'd never cycled more than 10 miles before. Then in September I cycled 2700 miles from Maine to Florida. It was great. I've just bought a Dawes ...
0
votes
1answer
34 views

Can I convert from a 52/42/30 crankset to 50/39/30?

I need to update my 9 speed triple crankset at 52/42/30, and those combinations seem difficult to find when I'm also looking to upgrade. A more common teeth combination seems to be 50/39/30, but I'm ...
-2
votes
0answers
50 views

I found this BMX need info

I found this bmx bike. It has strongman decals and has a looptail. Does anyone know any info on this bike?
2
votes
0answers
55 views

Bottle dynamo wiring a headlight and taillight on 1980s bike

I'm restoring a 1980 DBS Winner bicycle, and I'm having trouble wiring the dynamo to the headlight and taillight. As a disclaimer, I know very little about electricity and wiring. The dynamo has two ...
5
votes
4answers
134 views

Creaking when in the saddle

I know there are about a million questions on here about creaking while pedaling, but I haven't seen one that relates...apologies if I missed one. I bought a 2011 BMC Streetracer SR02 last year; ...
2
votes
1answer
94 views

Is this article accurate? If so, why is the hype about loosing the FD on enduro bikes?

I read an article on full suspension bikes, explaining antisquat and pedal kickback. They say the bicycle is the only vehicle, where the gear affects the suspension characteristics. This is great, ...
0
votes
0answers
22 views

1987 Schwinn Tempo Maillard hub rear axle

I have a 1987 Schwinn Tempo with 32h Maillard "Sealed mechanism" hubs. (I'm still confused about that phrase, maybe it's a bad translation? They're completely unsealed cup-cone hubs). The axle is ...
6
votes
1answer
551 views

Why exactly did Boardman manage a further distance than Wiggins?

In light of Bradley Wiggins' recent hour record of 54.526km, I heard a lot about how Chris Boardman has the absolute record of 56.375km. What I didn't hear and (hence my question) what I want to know ...
0
votes
2answers
51 views

Can an imperfect hub make a disc rotor rub?

I had a 160mm disc rotor on a road bike that was rubbing a bit in one spot, not severely, but enough for me to notice. I've tried to true it a few times over the past couple months with little ...
2
votes
3answers
117 views

Mountain Biker wanting to change to cyclo or road? Which one? [closed]

I ride an inexpensive Trek modified mountain bike and I spend some of my ride on the road and some on the canal, which of course is rather flat. Sometimes at the mid point of my ride I will decide to ...
1
vote
1answer
71 views

How can I tell where the damage is in the hub?

I am pretty new to bicycle maintenance. I've replaced brake cables, and patched tubes, but not much else. This week my plan was to clean up my back hub, because the wheel hadn't been turning as ...
1
vote
0answers
53 views

Considering Cassette Upgrade [duplicate]

I'm considering upgrading from a 9-speed, 12-26 cassette on a 2006 Lemond Alpe D'Huez. I have a triple front chairing with a Shimano 105 groupset, with one exception - an Ultegra rear derailleur. ...
1
vote
1answer
63 views

Chain keeps slipping

I was pedaling my bike, the bike has never been used and sat in the garage through winter. While I was pedaling I switched gears and adjusted the pressure I needed to pedal (don't know what this is ...
6
votes
1answer
275 views

How does a quill stem without a front bolt work?

Looking at quill stems I noticed this rather curious one and I couldn't imagine how it secured the handlebars without an apparent bolt. Any ideas? more images
1
vote
0answers
27 views

Buying Brakes for custom kick scooter with 12" diameter bmx wheels

I need to buy brakes for a custom kick scooter. The steel tubing of the entire frame is 1" in diameter. How do I know what size brakes to buy?
3
votes
2answers
116 views

Presta valve won't let air in on a new tube

During a ride I had a flat tire and used a brand new Joe's tube with sealant. For the first time in many years of riding i was not able to pump air in. It appears that the pin inside the valve won't ...
1
vote
0answers
25 views

Fork leaking oil?

After finishing my last two rides on my second hand bought bike, I've noticed both stanchions appear as if they are leaking oil Could it be just WD residues or excess suspension oil?
2
votes
2answers
97 views

For 'classic' cantilever brakes, are cartridge brake shoes better than non-cartridge ones?

What are the advantages of cartridge brake pads compared to non-cartridge ones? Do they offer better braking characteristics? I'm about to replace brake pads on a 1994 MTB which has Shimano STX ...
1
vote
1answer
58 views

Can anyone tell me the year of this Kona road bike?

Or any details! I know it is an older Kona bike and would like to sell, but would like to provide buyers with details. Thank you
2
votes
0answers
50 views

Shimano 105 ST-5500 gear sensor mechanism

I have a special question. I have a pair of Shimano 105 levers and I would like to know what short of mechanism is inside the shifter in order to track what gear it's on? Is it a potentiometer? Or ...
0
votes
2answers
122 views

back tire keeps going down

I have just bought a new bike and had it about a month now. I don't really know much about bikes but I do know how to repair an inner tube. I have had one puncture and just bought a new inner tube. ...
3
votes
3answers
714 views

Replacing an 8-speed cassette with a 9-speed one to make my bike faster

I'd like to make my 8-speed tokyobike Classic Sport city bike go faster so I'm considering replacing the 8-speed cassette with a 9-speed one which can be found on the tokyobike Sport. The bike has ...
2
votes
2answers
53 views

Shimano short cage rear derailleur capacity

Can an Ultegra or 105 short cage RD handle a 30T ?
0
votes
1answer
31 views

determining make model and year of a BMX frame

is there a specific website where I can simply enter the bicycle serial number to determine the make model and year primarily BMX frames
0
votes
1answer
34 views

Need help picking the right rear derailleur and chain for Giant Escape 2

Product page for the bike i have: http://www.giant-bicycles.com/en-us/bikes/model/escape.2/14810/75679/#specifications I'm not able to make sense of the variations of shimano altus derailleurs, ...
0
votes
1answer
41 views

Freewheel sprocket locking up

I was just out riding my bike. Its nothing fancy, just a €300 single-speed with with a flip-flop hub. I usually ride the freewheel side. Today it made some weird noises and decided to lock up / be a ...
1
vote
1answer
84 views

Electric Bike (eBike): Freewheel or Regenerative braking?

Not asking for opinion which one is better, so please do not state without some reasons why one is better than another on eBike. Question is: Freewheel or Regenerative braking is more efficient in ...
1
vote
0answers
41 views

Sachs- Huret derailleur (re)installation

Sachs - Huret derailleur installation So the learning curve continues on the '85 Peugeot P-16. The main lessons are to take pictures and time getting each thing done. I have the rear derailleur ...
1
vote
0answers
42 views

which multi-speed hub should I upgrade my trek district to

So my rear freewheel hub broke on my single speed belt driven (no metal chain) trek district. Since I have to replace the rear hub, I'm thinking of replacing the rear hub with an internally geared ...
1
vote
1answer
55 views

Carbon-wrapped Aluminum seatpost?

I have the seatpost shown in the pictures below. It came on a 2010 Specialized Tricross. It looks like Carbon fibre on the outside, but when you look at the open end of the tubing, it actually looks ...
0
votes
1answer
48 views

Ambidextrous backup downtube shifter for touring?

I'm heading out on a long tour soon on a bike with Shimano STI shifters. That choice was intentional as I don't like bar-ends. However, I notice the gear cables run through stops at downtube shifters ...
0
votes
1answer
75 views

Should I stick with my Stolen (brand) BMX or should I build my own bike? [closed]

I live in Greece and I am 13 years old. Recently I found a Flatland frame and thought about building my own bike. Should I build my own bike or should I stick with the Stolen BMX I already have? I ...
1
vote
1answer
102 views

What year is this Specialized Stumpjumper FSR?

I'm interested in buying this, but was curious as to what year the frame is? Any help would be much appreciated.
2
votes
1answer
75 views

Should disc brake rotors be removed when packing bike for travel?

I've been looking at a few tutorials on packing a bike to take it on a plane, and most of them make no mention of disc brakes. One did specifically mention disc brakes, and recommended taking the ...
2
votes
0answers
30 views

Are there any Male to Female DI2 wires / exetensions?

I know you can use a junction port (ie: SM-JC41 Internal Junction Box B) for this, but are there any Male to Female extension cables? Root Cause: R600 to 5 port junction for a TT setup near the base ...
2
votes
2answers
84 views

Will two spacers between the cassette and the hub effect the chain line?

So I have a set of custom wheels (White Industries T11 hubs) and when the cassette is correctly fastened to the hub with the single spacer provided the cassette cogs can be moved in the direction ...
2
votes
2answers
54 views

How many spacers I can put on a Shimano hollowtec 2 BB for a 68 mm BB shell

My bottom bracket shell is 68 mm English thread. I put a 1 mm spacer on the drive side BB to move the chain rings further away from the frame, so to prevent the chain rub against the inside of the ...
2
votes
1answer
47 views

Missing lock nut part

Not sure what to call it, but a couple of my wheels are missing the grippy washer thing that sits on the lock nut. They seem to be attached to the lock nut to begin with, but they just fall off after ...
0
votes
0answers
30 views

What type of grease to use as general purpose bearing lubricant? [duplicate]

Lithium grease, white litium grease, graphite grease, carbon grease, SRAM`s Liquid O-ring. And those are only the types of greases I have heard about. What type of grease would be suitable for ...
1
vote
0answers
39 views

Specialized Brain problem

I have been searching for a while regarding a problem with my Specialized Brain. Here is the story.. I bought a 2008 Specialized Stumpjumper Expert 2nd hand and immediately noticed air in the shock. ...
1
vote
1answer
48 views

Alleviating pressure from coccyx with padded shorts

I recently started biking again after 5 years. However, I had endured unusual coccyx pain when I had a longer than usual ride (~11 miles). I even had my skin chafed/torn where the tailbone meets the ...
2
votes
2answers
73 views

22 to 11 speed conversion?

I have a bike equipped with a SRAM 22 speed groupset (hydraulic) and was thinking about converting it to a 1x11. I like the simplicity of the 1x11 system and the potential weight savings from removal ...
4
votes
3answers
282 views

Does cycling make one's knees stronger?

I'm wondering if riding hard strengthens the knee or causes degradation? I exercise regularly and am in solid physical condition. When strength training off of the bike, I do a lot of leg work ...

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