The London Cycling Campaign is to hold its second protest in a week, following the death of a man in Holborn.
Around 1,500 cyclists took part in the last protest ride from Tower Hill to Aldgate, which aimed to highlight the lack of separate cycle lanes on some of the capital's busiest roads.
This evening's protest begins at 6.30pm at Russell Square.
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Stamp duty is to be abolished for first-time buyers on properties up to £300,000, Chancellor Philip Hammond has announced in his Budget.
The money will help pay for mental health and counselling services, regeneration in the west London neighbourhood and a new community space.
The small device was hidden in a grate in the ceiling in the only customer toilet at a Starbucks coffee shop.