Why don't you go for the HS11s, they are much cheaper and include the brake booster as well? I cannot see why you need to pay the considerable extra for the 33s.
Magura Brakes
- Thread starter tillson
- Start date
Yes, good point. For some reason I had only considered the HS33s. The HS11s are £30, cheaper and also come with the brake boosters. Thanks for that.
Tom
It fits between the brake studs on the forks or rear frame. When you brake, you force these studs outward as there is some flex in the frame, forks and the studs themselves. The boosters 'tie-in' the studs so they no longer flex and thus you get better, firmer braking. Sorry but this is difficult to explain in words and much better to explain in pictures. Here is what the boosters look like.Magura brake booster
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Brake boosters are the stiffening frames which span between the forks. Here is a picture of one.
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Brake boosters are basically just a stiffener (a loop of metal) connecting the two sides of the frame between the brake mounting points, over the wheel. The idea is to prevent the pressure from the brakes spreading the frame, thus putting all the pressure from the brake pads on to the rim, rather than distributing the force between the rim and flexing the forks or rear frame members.
Phil
Oops, crossed posting with Tillson! and Harry B. Must learn to type faster....
Phil
Phil
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We all have different ways of explaining things so the more explanations the better.
If you are not running fat 2" tyres this one is worth considering:
SJS custom booster
I use this with the HS66's which didn't come with boosters.
Robin
SJS custom booster
I use this with the HS66's which didn't come with boosters.
Robin
I have opted for the HS33 brakes and they arrived this morning.
Fitting was going well until I have come to the removal of the existing Shimano V brakes. Item 1 here, the Link Fixing bolt is insanely tight. This is compounded by the fact that it is a hexagon socket head bolt which is somewhere between 5 and 5.5 mm. My 5 mm wrench feels just a little bit too loose and the 5.5 mm is too large to fit in. I don’t think there is a 5.25 mm and it is unlikely to be an imperial size. The actual depth of the socket is very shallow too (much less than an expected 7.5mm minimum), which makes matters even worse.
I know by feel that the 5 mm wrench is going to slip and chew up the inside of the socket. If all else fails I’ll drill the head off the bolt and use a stud extractor to get the rest out, but this isn’t a very pretty option.
Has anyone removed these bolts before and if so how did you manage it?
Thanks
Tom
Fitting was going well until I have come to the removal of the existing Shimano V brakes. Item 1 here, the Link Fixing bolt is insanely tight. This is compounded by the fact that it is a hexagon socket head bolt which is somewhere between 5 and 5.5 mm. My 5 mm wrench feels just a little bit too loose and the 5.5 mm is too large to fit in. I don’t think there is a 5.25 mm and it is unlikely to be an imperial size. The actual depth of the socket is very shallow too (much less than an expected 7.5mm minimum), which makes matters even worse.
I know by feel that the 5 mm wrench is going to slip and chew up the inside of the socket. If all else fails I’ll drill the head off the bolt and use a stud extractor to get the rest out, but this isn’t a very pretty option.
Has anyone removed these bolts before and if so how did you manage it?
Thanks
Tom
I removed V brakes from an Agattu and had no problems. I used a bicycle multitool and didn't even have to resort to my allen key kit. I know they feel tight but they do come out from my experience.
Can you remember the size of the socket wrench you used HarryB? I feel sure the 5mm is going to slip and chew up the head. All 4 bolts feel the same.
Thanks
Tom
It was a 5 and I know they feel tight (and quite loose fitting) but I haven't stripped one yet - just make sure you shove the allen key in as far as it will go. I think you could remove any that do strip with a mole grip, not the most elegant method but the maguras come with their own special screws anyway.
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Yes I am sure that they are 5 mm as well, but a very sloppy fit. Thanks for confirming my thoughts anyway.
I have just knackered one of the heads. The socket wrench just turned in the head and rounded it out inside. It’s not a worn wrench either. I have tried several and all are a very loose fit.
Well, plan B now. Slot the head and try with a screwdriver bladed head on a socket wrench. That will have to wait until I get home though.
The threads must have picked up a bit on my bolts. Fitting of the Maguras looks quite straightforward though once the V brakes are off.
Thanks
Tom
One thought - is it the allen key rounding or the bolt itself? The best allen keys are very dark almost black in colour. I have no idea what they are made of but they are very hard. The one that come with socket sets are grey and incredibly soft and will round very easily.
My allen keys are the black ones. I know what you mean about the grey ones, they sometimes come with self assembly furniture and are very soft. I have also used an allen key that is set into the end of a Snapon 1/2" drive socket.
It is the bolt that has rounded off. The head is made from a very soft aluminium alloy which has similar mechanical properties to cheese.
I'll just have to be patient and wait until I can get at the tools I need to extract it. All very frustrating though as I want to play with my new brakes!
I have now fitted the Magura brakes. The retaining bolts on the Shimano V brakes were really difficult to remove. I think the bolts had corroded in the threads slightly. The sockets on the retaining bolts are quite shallow which doesn’t allow you to get much purchase on the bolt. This results in the allen key chewing up the bolt head. This happened on all four bolts. In the end, I had cut a slot into the head of each bolt and use a piece of angle iron as a makeshift wrench. Even then they were incredibly hard to remove.
It may be worth trying to remove them before they seize into the thread on newer bikes, just to keep the threads clean.
Once the old V brakes were off the bike, the Maguras were a delight to fit. Very straightforward and easy to adjust. Each set took about 45 minutes to fit and adjust.
I haven’t been far on the bike since fitting them but they feel very nice and progressive. I don’t think that they are hugely more powerful than the Shimano V brakes but the braking characteristics are a definite improvement.
Time will tell if they were worth a hundred quid.
It may be worth trying to remove them before they seize into the thread on newer bikes, just to keep the threads clean.
Once the old V brakes were off the bike, the Maguras were a delight to fit. Very straightforward and easy to adjust. Each set took about 45 minutes to fit and adjust.
I haven’t been far on the bike since fitting them but they feel very nice and progressive. I don’t think that they are hugely more powerful than the Shimano V brakes but the braking characteristics are a definite improvement.
Time will tell if they were worth a hundred quid.
I think most of the benefit is in not having to do much maintenance. The pads last for ever (they are nice and thick) and the rim doesn't seem to wear as quick with the magura pads.
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